At GDC the most important thing (for me at least, seeing as I am about to graduate school) is the Job fair.
The job fair serves two purposes, the first more obvious one is to look for prospective employers. The other is to be able to infer on future projects. For example if a company looking to hire people with MMO and network experience, it can be pretty obvious that they are planning on developing an online game.
I stopped by the Roblox booth while I was there and talked with the people there and we joked about how annoying our trolls are. I ended up getting an application slip (though I don't plan on applying). One of the types of people they are looking for are iPad developers.
Just thought this was interesting and some people might want to know this.