I went on Thursday and you're right, Lee_OC, it was very crowded. This is the first year ever that all four days sold out, so with the huge capacity of the convention center, that's saying something.
I was impressed to see so many publishers there, both independent and commercial, representing graphic novels, manga, comics, and, regular old prose novels, SF/F and YA. Lots to see.
Lots of book signings this year, too.
Here's a Nervous Breakdown article I wrote about it, with pictures--I hope an on-topic plug is okay?