First off, great gem. :P

I'm learning Rails and Ruby through Mozilla's Webcraft online course program, and used your gem to add comments to our blog sample project. I wanted to be able to refer to the same comment thread from multiple URLs (I have permalinks and you can also access posts via the post id). So I added the :identifier option to disqus_thread.

Let me know if I've made any big mistakes, still trying to learn the Right Way (tm) to do things in Ruby and Rails. :P Thanks!