Some of the features include things like “maps” (including aerial imagery), “directions”, “search”, “traffic” and “find me” (to track you along a route. Certainly nice features for a handset, but nothing new.
Still, if you have a Blackberry it’s probably worth giving it a shot. It’s currently compatible with the BlackBerry 8830 on Sprint and the Blackberry 8800, 8820 and 8310 on AT&T. Of course, “support for additional handsets is coming soon.” To get it, simply point your phone to www.mq4m.com to get started.