Right now, it's pretty simple. It just creates a buffer and shoves your tasks into it. I've only tested it on GNU Emacs 22.214.171.124. Ultimately, I'd like it to sync between an orgmode file and RTM, kind of like what Sacha Chua did with org-toodledo.
So, have at it. Feel free to fork it and send me pull requests. I'm hoping to release early (DONE!) and often.