omg! Last time I went, I had a blast. I even saw Aria Giovanni and that awesome clown from House of Thousand Corpses. It's been a few years since I have been to it, but here's what I remember:
long lines!
all kind of games
TV
Movies
Toys, collectibles
figurines
paintings (all kinds of art, I guess

)
people dressed up in costumes
hot chicks (lol)
comics (LOTS)
authors
porn stars
movie stars
anime
Oh yeah, make sure you get your hotel situation figured out... nothing sucks like having to settle for a place that's not within walking distance. Plan to arrive early too (because of the long lines). You also might want to check out youtube. They might have some interviews or footage of the previous events.
To sum it up, it's all about the media. ;)
Edit: I wish I had kept my catalog. They usually send me one every year... but, their website is just as good.
