gistfile1.diff

-  has_attachment :content_type => :image, 
-                 :thumbnails => {
-                   :thumb => [80,80], 
-                   :small => '320x320>'
-                  }, 
-                  :storage => :s3, 
-                  :s3_access => :private
+
+  has_attached_file :photo, 
+                    :styles => { 
+                      :thumb => ["80x80#", :jpg], 
+                      :small => ["320x320>", :jpg] 
+                    }, 
+                    :storage => :s3, 
+                    :s3_credentials => "#{RAILS_ROOT}/config/amazon_s3.yml", 
+                    :s3_permissions => 'private',
+                    :path => ":id/:style.:extension", 
+                    :bucket => "#{RAILS_ENV == 'production' ? 'photos' : 'backup'}_bucket"