The QCF team was apparently so excited to be at GDC that they gamed all over the internet.
You may have seen my column a couple weeks ago wherein I wrote about why you should probably be playing Desktop Dungeons. Well now is your chance to play the Beta for absolutely free, but only while GDC is going on. That means you only have until Saturday, so take a half hour out of your day and give this great game a shot.
Check it out here: Desktop Dungeons Site