Today is the big day for iPhone fans looking to get their hands on the new iPhone 3G S. The catch for some iPhone 3G owners is that AT&T’s upgrade plans for the iPhone 3G S are not that great if you haven’t had your old iPhone that long.

NextWorth has announced an upgrade program for iPhone 3G owners that may give enough cash to upgrade to the 3G S iPhone. The company says that some that trade-in their old device may even have cash left over after they buy the iPhone 3G S.

With the iPhone 3G S coming there are a glut of cases coming to the market. If you are upgrading from the iPhone 3G, you really don’t need a new case, but who wants to put their shiny new phone into an old scratched up case?

Among the new cases that Belkin is offering are the Grip Cases and a line of BodyGuard cases. The BodyGuard cases aren’t available in North America for some unknown reason. The other cases are available now in America and Europe.