I found I could describe this in 2 ways:

* Chat.StackOverflow without StackOverflow

* IRC-like chatrooms

Would be awesome if you offer to connect to some user feedback service like getsatisfaction or uservoice. I'm sure a lot of people would like to offer this as a kind of support channel for their services.

Some suggestions:

1.) decrease the width of the left sidebar

2.) signup form doesn't submit when i press enter (the one where i signup with invite code). have to submit by clicking the signup button.

3.) you could make a business by charging people for making bots. or charging for chatrooms with more than a specific number of people online at a time (if it's a business).

4.) allow people to choose different nicknames for each channel.

5.) facebook widgets on the group pages for group chat :)

These are just random ideas that occured to me. On the whole, it's a cool service with potential.