In order to join your iPhone 2.0+ to your corporate secured wireless network that uses PEAP or other protocol, you have to use the iPhone Enterprise Configuration Tool. It's not possible to configure it from the phone itself apparently. Seems there are two ways to get the configuration profiles onto your iPhone:
Via the web, by hosting the .mobileconfig file on a network accessible IIS or OSX Server.
ifixit.com is a great page for those that want to tinker w/ their Apple branded product. I read their page to put in a bigger hard drive into my Mac Pro. Apple makes it fairly difficult to swap the hard drive on their Mac Pro line. Hopefully that'll change w/ their new Mac Pro model this year.