I've discovered Skype. I had it installed some time now, but never used it until a friend of mine told me he always holds group chats on it. Well, installed the latest version and made fun until 3AM. Quite cool to have a headset on your head, make jokes and talk about stuff while being able to do whatever you like.
I know it's binary only, but the Linux version works great for me. The Debian package doesn't contain the latest version, so I just grabbed the tarball from the Skype site and copied the binary over the installed one. Works great :)
So, anybody who's interested and wants to try it out, my skype id is aquatix.