The Dragon Quest IX beanbag lounge was probably the most epic thing there, imo. We hung with many different people, and made friends with some.
This was my first PAX and now I have high expectations for next year. xD
Nintendo probably had my favorite booth with DQIX, Kirby's Epic Yarn, and lots of other awesome stuff there.
The Yakuza 4 demo had me VERY VERY excited. I can't express how excited I am for that game to come out. It's probably my most anticipated game at PAX.
Final Fantasy 14 was neat. It will definitely be better when I have lots of friends to play with. Hopefully we'll be able to convert all our FFIX friends to play with us. From what I can tell on Twitter quite a few of my friends are going to play once it is released, so that will be great! (I am planning on joining the Mysidia server.)
Hmm... that's all I can think of at the moment.