Except for a few failing tests, this seems to be working.

Rakefile

@@ -65,6 +65,7 @@ spec = Gem::Specification.new do |s|
   s.author            = "Jon Yurek"
   s.email             = "jyurek@thoughtbot.com"
   s.homepage          = "http://www.thoughtbot.com/projects/paperclip"
+  s.description       = "Easy upload management for ActiveRecord"
   s.platform          = Gem::Platform::RUBY
   s.summary           = "File attachments as attributes for ActiveRecord"
   s.files             = FileList[include_file_globs].to_a - FileList[exclude_file_globs].to_a

lib/paperclip/attachment.rb

@@ -291,7 +291,7 @@ module Paperclip
     end
 
     def callback which #:nodoc:
-      instance.run_callbacks(which, @queued_for_write){|result, obj| result == false }
+      instance.run_callbacks(which, @queued_for_write)
     end
 
     def post_process_styles #:nodoc:

lib/paperclip/iostream.rb

@@ -5,7 +5,7 @@ module IOStream
   # Returns a Tempfile containing the contents of the readable object.
   def to_tempfile
     name = respond_to?(:original_filename) ? original_filename : (respond_to?(:path) ? path : "stream")
-    tempfile = Paperclip::Tempfile.new(File.basename(name))
+    tempfile = Paperclip::Tempfile.new("stream" + File.extname(name))
     tempfile.binmode
     self.stream_to(tempfile)
   end

paperclip.gemspec

@@ -6,16 +6,17 @@ Gem::Specification.new do |s|
 
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
   s.authors = ["Jon Yurek"]
-  s.date = %q{2009-10-09}
+  s.date = %q{2010-03-25}
+  s.description = %q{Easy upload management for ActiveRecord}
   s.email = %q{jyurek@thoughtbot.com}
   s.extra_rdoc_files = ["README.rdoc"]
-  s.files = ["README.rdoc", "LICENSE", "Rakefile", "init.rb", "generators/paperclip", "generators/paperclip/paperclip_generator.rb", "generators/paperclip/templates", "generators/paperclip/templates/paperclip_migration.rb.erb", "generators/paperclip/USAGE", "lib/paperclip", "lib/paperclip/attachment.rb", "lib/paperclip/callback_compatability.rb", "lib/paperclip/geometry.rb", "lib/paperclip/interpolations.rb", "lib/paperclip/iostream.rb", "lib/paperclip/matchers", "lib/paperclip/matchers/have_attached_file_matcher.rb", "lib/paperclip/matchers/validate_attachment_content_type_matcher.rb", "lib/paperclip/matchers/validate_attachment_presence_matcher.rb", "lib/paperclip/matchers/validate_attachment_size_matcher.rb", "lib/paperclip/matchers.rb", "lib/paperclip/processor.rb", "lib/paperclip/storage.rb", "lib/paperclip/thumbnail.rb", "lib/paperclip/upfile.rb", "lib/paperclip.rb", "tasks/paperclip_tasks.rake", "test/attachment_test.rb", "test/database.yml", "test/fixtures", "test/fixtures/12k.png", "test/fixtures/50x50.png", "test/fixtures/5k.png", "test/fixtures/bad.png", "test/fixtures/s3.yml", "test/fixtures/text.txt", "test/fixtures/twopage.pdf", "test/geometry_test.rb", "test/helper.rb", "test/integration_test.rb", "test/interpolations_test.rb", "test/iostream_test.rb", "test/matchers", "test/matchers/have_attached_file_matcher_test.rb", "test/matchers/validate_attachment_content_type_matcher_test.rb", "test/matchers/validate_attachment_presence_matcher_test.rb", "test/matchers/validate_attachment_size_matcher_test.rb", "test/paperclip_test.rb", "test/processor_test.rb", "test/storage_test.rb", "test/thumbnail_test.rb", "test/upfile_test.rb", "shoulda_macros/paperclip.rb"]
+  s.files = ["README.rdoc", "LICENSE", "Rakefile", "init.rb", "generators/paperclip", "generators/paperclip/paperclip_generator.rb", "generators/paperclip/templates", "generators/paperclip/templates/paperclip_migration.rb.erb", "generators/paperclip/USAGE", "lib/paperclip", "lib/paperclip/attachment.rb", "lib/paperclip/callback_compatability.rb", "lib/paperclip/geometry.rb", "lib/paperclip/interpolations.rb", "lib/paperclip/iostream.rb", "lib/paperclip/matchers", "lib/paperclip/matchers/have_attached_file_matcher.rb", "lib/paperclip/matchers/validate_attachment_content_type_matcher.rb", "lib/paperclip/matchers/validate_attachment_presence_matcher.rb", "lib/paperclip/matchers/validate_attachment_size_matcher.rb", "lib/paperclip/matchers.rb", "lib/paperclip/processor.rb", "lib/paperclip/storage.rb", "lib/paperclip/style.rb", "lib/paperclip/thumbnail.rb", "lib/paperclip/upfile.rb", "lib/paperclip.rb", "tasks/paperclip_tasks.rake", "test/attachment_test.rb", "test/database.yml", "test/fixtures", "test/fixtures/12k.png", "test/fixtures/50x50.png", "test/fixtures/5k.png", "test/fixtures/bad.png", "test/fixtures/s3.yml", "test/fixtures/text.txt", "test/fixtures/twopage.pdf", "test/geometry_test.rb", "test/helper.rb", "test/integration_test.rb", "test/interpolations_test.rb", "test/iostream_test.rb", "test/matchers", "test/matchers/have_attached_file_matcher_test.rb", "test/matchers/validate_attachment_content_type_matcher_test.rb", "test/matchers/validate_attachment_presence_matcher_test.rb", "test/matchers/validate_attachment_size_matcher_test.rb", "test/paperclip_test.rb", "test/processor_test.rb", "test/storage_test.rb", "test/style_test.rb", "test/thumbnail_test.rb", "test/upfile_test.rb", "shoulda_macros/paperclip.rb"]
   s.homepage = %q{http://www.thoughtbot.com/projects/paperclip}
   s.rdoc_options = ["--line-numbers", "--inline-source"]
   s.require_paths = ["lib"]
   s.requirements = ["ImageMagick"]
   s.rubyforge_project = %q{paperclip}
-  s.rubygems_version = %q{1.3.5}
+  s.rubygems_version = %q{1.3.6}
   s.summary = %q{File attachments as attributes for ActiveRecord}
 
   if s.respond_to? :specification_version then
@@ -23,23 +24,23 @@ Gem::Specification.new do |s|
     s.specification_version = 3
 
     if Gem::Version.new(Gem::RubyGemsVersion) >= Gem::Version.new('1.2.0') then
-      s.add_development_dependency(%q<thoughtbot-shoulda>, [">= 0"])
-      s.add_development_dependency(%q<jferris-mocha>, ["= 0.9.5.0.1241126838"])
+      s.add_development_dependency(%q<shoulda>, [">= 0"])
+      s.add_development_dependency(%q<jferris-mocha>, [">= 0.9.5.0.1241126838"])
       s.add_development_dependency(%q<aws-s3>, [">= 0"])
       s.add_development_dependency(%q<sqlite3-ruby>, [">= 0"])
       s.add_development_dependency(%q<activerecord>, [">= 0"])
       s.add_development_dependency(%q<activesupport>, [">= 0"])
     else
-      s.add_dependency(%q<thoughtbot-shoulda>, [">= 0"])
-      s.add_dependency(%q<jferris-mocha>, ["= 0.9.5.0.1241126838"])
+      s.add_dependency(%q<shoulda>, [">= 0"])
+      s.add_dependency(%q<jferris-mocha>, [">= 0.9.5.0.1241126838"])
       s.add_dependency(%q<aws-s3>, [">= 0"])
       s.add_dependency(%q<sqlite3-ruby>, [">= 0"])
       s.add_dependency(%q<activerecord>, [">= 0"])
       s.add_dependency(%q<activesupport>, [">= 0"])
     end
   else
-    s.add_dependency(%q<thoughtbot-shoulda>, [">= 0"])
-    s.add_dependency(%q<jferris-mocha>, ["= 0.9.5.0.1241126838"])
+    s.add_dependency(%q<shoulda>, [">= 0"])
+    s.add_dependency(%q<jferris-mocha>, [">= 0.9.5.0.1241126838"])
     s.add_dependency(%q<aws-s3>, [">= 0"])
     s.add_dependency(%q<sqlite3-ruby>, [">= 0"])
     s.add_dependency(%q<activerecord>, [">= 0"])

test/attachment_test.rb

@@ -106,7 +106,7 @@ class AttachmentTest < Test::Unit::TestCase
       @dummy.stubs(:id).returns(@id)
       @file = StringIO.new(".")
       @dummy.avatar = @file
-      Rails = stub('Rails', :root => @rails_env)
+      Rails.stubs(:env).returns(@rails_env)
     end
 
     should "return the proper path" do

test/iostream_test.rb

@@ -66,7 +66,7 @@ class IOStreamTest < Test::Unit::TestCase
         name = File.basename(@file.path)
         extension = File.extname(name)
         basename = File.basename(name, extension)
-        assert_match %r[^#{Regexp.quote(basename)}.*?#{Regexp.quote(extension)}], File.basename(@tempfile.path)
+        assert_match %r[^stream.*?#{Regexp.quote(extension)}], File.basename(@tempfile.path)
       end
 
       should "have the Tempfile contain the same data as the file" do