TM infringement.. IMHO, all ipod-touch ones are going to be worth very little, Apple likes to go after domainers for names like this. Besides, the ipod has been out for several years now and you are obviously registering these types of domains to "cybersquat" which is frowned upon in most domain communities.
You would be better off spending your time and $ on some nice generic domains, and developing those. I don't touch trademarked domains anymore.. Sorry