Whilst T-Mobile has been offering the upgrade to the very popular Dash.  They are now the first US operator to provide an out of the box Windows Mobile 6 device!

Launching in T-Mobile retail stores tomorrow and available online now, the Wing is 30% smaller than its predecessor, the MDA, and features Microsoft Office Mobile, Windows Live Services and Live Search as well as Voice Command. The Wing has a blue soft-touch exterior, a newly designed keyboard and Wi-Fi.

You can get more details about the device HERE