How to backup or restore and iPhone or iPod touch

I'm working on transferring information from an iPhone 3G to and iPhone 3G S and needed to find out how to backup the information from the iPhone 3G and restore it to the 3G S. It turns out that Apple already has an article written for this, and the process is very simple. It's really just a matter of changing a radio button. Rather than write it all out here, the link to the Apple article is http://support.apple.com/kb/HT1414. This would also cover how to restore settings to an iPhone that stops working like normal, assuming you can still get a computer to recognize the device. It also has instructions for how to update your iPhone, which may be useful with the recent release of the iPhone 3.0 OS

If you're wondering how to change the iTunes account associated with your iPhone, check out this other post.