Yeah, I remember back in 2002 we scored a bunch of cool swag. Got a free X box, 5 x box games, a copy of burnout 2, and coupons for a free copy of Metroid Prime and $50 off a platinum GC. Sony gave us a nice hat and keychain. So don't be expecting much of anything from Sony, is my recommendation. Altho I hear that a year or two ago they did give out PSPs.
We also got to play new shit before it came out. I played Wind Waker, MP and other shit. I think I even posted impressions on GAF, since this was back when I bothered to post on the gaming forum. Of course the conference sucked because it was in Grapevine, TX where the home offices were and we weren't allowed to leave the hotel under threat of being fired.