Morph:
If you're talking about one of those "free widget" sites, one of them currently owns ipodmini.com. Based on the fact that they haven't been sued out of existence (yet), I'd say it would probably be safe to at least try it out for a while.
Some companies, though, don't like you having their company (and/or product) name in ANY part of your domain. In my experience, though, Apple is not one of them (excluding the itunes.co.uk case).