ITCom has a set of Frequently Asked Questions about Cellular Phones that includes information about the iPhone.
The U-M Computer Showcase offers the iPod touch for sale to members of the U-M community at academic pricing. It also sells accessories for these units.
MWireless is the new, more secure way to use U-M's wireless network.
Though the iPhone is not an operating system officially supported by ITS, you can download an MWireless installer for the iPhone and iPod touch. On this page also is the configuration information you'll need to get set up.
A virtual private network (VPN) is a method for making even insecure network connections more secure. The U-M VPN service requires the download of a small piece of software, the Cisco VPN client.
Though the iPhone is not an operating system officially supported by ITS, you can download the VPN client for the iPhone.
The Exchange Technical Library has links to how-to documentation on using the iPhone and iPod touch with the ITS Exchange Service.