Russell Beattie has a long post about the “.mobi” domain. I personally think that .mobi is a great idea because so many mobile site addresses are so damn confusing (see some of the examples on Russell’s post).
The .mobi domain launches May 2006 with an early registration for trademark holders. If you own a trademark you may want to think about jumping on this before someone else starts snatching up these domains.
Link — .mobi
Link — Russell’s post