Heya, wow looks kewl! When exactly did you order this mac? If you ordered it in October, go to pick up Mac OS X Leopard. Its the new operating system, like Vista compared to XP, it was released yesterday, and I believe anyone who ordered a mac in october that hasn't got it already can get it for free or $10 or something. Its really easy to install and the upgrade works fine unlike with Windows, so all your settings will stay.

For programs, if you want to run Windows on top of OS X without rebooting, get VMWare Fusion. Don't get Firefox, it sucks. The new Safari that comes with Leopard is good, or else Camino which is almost the same as Firefox but with less suckage.

Ill give you more tips but right now im really busy setting up triple-booting on my mac, so Ill post back later.