Twitter RESTful API

That past couple of weeks I've been working on consuming Twitter's API (unpaid side project):
http://groups.google.com/group/twitter-development-talk/web/api-documentation

I think the project I'm on is pretty much NDA'd - so I can't discuss much more other than that, but the RESTful API concept in general is interesting. I'm also looking into CodeIgniter for PHP (feels like ruby on rails?).

I'll post updates on the Twitter project as it becomes more "live", but it's exciting. I'm working with a very talented graphics developer (responsible for AOL's blogs), and a successful project manager from ThinkPocket.