When is Steam on Mac?

Anybody know when Valve is going to release steam for the mac? I know they said it was in april but is there any official date announced, we are already on the 19? Maybe there is some information I have not heard yet? I am really excited, I can't wait for the day when i won't have to reboot my Mac into windows to get my Team Fortress 2 Fix.

Thanks Guys.

The beta has been going on for a little while...

http://store.steampowered.com/macbeta/

Wait Macs can play games? I guess that the value team just figured this out.