Congrats and welcome to CB. Make sure to get opera mini and google maps. THe 8310 is a great device. Also I would get a skin, hip holseter, and a 4 gig sd card right away. All of that you can get at the CB store.
Welcome to CB, I remember that wow feeling well.
If you're a rough and tumble guy allow me to suggest an Otterbox case. It's as rugged as they come. If you're more careful with your toys a skin works well. Search for discussions on everything from micro SD cards to the best IM client and long life batteries. There's a ton of things to keep your addiction well fed here.