The most awesome thing I've seen in two and a half hours at MacWorld? GameSalad.com. Bear in mind that I only spent fifteen minutes with it, so it could turn out to be a pile of hooey, but I kinda don't think so. For $99/year, you get access to their game design tools and templates and the ability to publish your working games to iPhone OS and Web-compatible formats. It works, and it's really simple. In my fifteen minutes with the system I made versions of Asteroids and Breakout (the old arcade classics) with various members of the PhoneDog staff swapped in for the spaceship, asteroids, and Breakout bricks. Awesome. Design a game, publish it to the App Store, and start counting your money!

Also pretty cool is the Beats by Dr Dre. Solo headphones, now with iPhone-compatible inline microphone/remote. The $180 little brother to the Studio models will soon be available in an "HD" version. And the bad boys themselves, the $300 Studio cans, were also being shown in a soon-to-be-released version featuring the iPhone mic/remote. Monster is just waiting for Apple to certify the new version of the Studio headphones as ready for sale.

Trexta's Sketch Up iPhone/iPod Touch cases are charmingly simple, and totally great. These recyclable paper/plastic cases are meant to be drawn on! Take some magic markers, customize the case with your own designs, and snap one on to your phone. And there you go, a totally one-of-a-kind iPhone case. Simple, easy, and fun. The cases will be available soon in three-or-five packs, and are going to be priced "very aggressively."

Speck was showing off their line of iPhone and iPod Touch cases, including the new "Fitted" models.  Aaron found an argyle pattered case that's a great match for his enormous collection of tweed jackets. As you can see, he was pretty stoked.