This is a simple Rails (2.3.4) app that shows using Uploadify www.uploadify.com to upload multiple image files, using Paperclip to store them.
I originally built this while testing it myself, and am putting it up since I didn't ever find a clear and complete example that worked in 2.3.4.
It's a standard Rails app, nothing special. The code does depend on the mime-types gem, so you will need to install that.
Thanks to several people, from whom I pulled bits of this from: