Features to try out:
Inline image parsing + posting. Post an image URL or drag an image from your desktop into the chat window.
You can make a new room by just go to the desired URL. In theory, all rooms always exist haha. Send the link to your friends/etc. and enjoy!
You can invite friends via email by typing "/invite firstname.lastname@example.org"
You can send private messages by mentioning a user: "@user2 only you can see this"
You can also whistle at people to get their attention by just mentioning them: "@user2".
Still very much in progress!