Even though I only went to GenCon on Saturday, I've got a few observations.
If booth area given to a company is related to how big they are, Catalyst rocks and Gencon knows it! Totally the best booth spot in the whole con! There was (as far as I saw) constant traffic at the Catalyst booth, at the register buying stuff, trying the demos, or just staring in awe at the big tv screen for the Mechwarrior demo. By far a better booth location and setup (and busier) than that other game company who sells that other 4th ed game that starts and ends with a "D".
The swag this year sucked, IMO. I got one commemorative d6, the big book, a Magic the Gathering booster pack of 6 cards, and a bunch of ads. There weren't many booth babes and they weren't giving out much of anything either. There were no special celebrities there when I was other than the very excellent author Michael Stackpole, whose hand I shook.
Catalyst also got primo spots for their meetings, only one hotel away from the convention center and accessible by skyway!
And if you've never tried the Battlemech pods, you are so missing out! Loved them! The only bad part was that they were so good, the line was pretty long to get in one. But totally worth it!