Glad you like it!
It's not working on the forums either I think… and it hasn't been tested that much yet. I'll put it on the list, but it's something for later when I'll be optimizing and polishing things.
If you are using Firefox you can try Ctrl-+ and Ctrl--. Opera has a built in zoom feature too, but unfortunately it doesn't work so well with this site due to its unique features, ahum. And IE.. well, let's just wait for IE7, shall we?