OSAlt - Open Source Alternative Software

I came across this site this morning while looking through my LifeHacker RSS feed. OSAlt is a very cool site where you can enter what type of application (business, communications, etc), or a specific application and find any open source alternatives to it. I am frequently looking for open source alternatives to commercial applications and I am definetely going to be adding this site as one of my first places to search (along with sourceforge.net).