Here’s a page of video walkthroughs from T-Mobile to help new users get acquainted with their phones. In the demo on how to setup a shortcut key they show mapping the key for visual voicemail is the default:
Also, the HD2 will come with DoubleTwist preinstalled on the phone. This is the app that lets you sync with your PCs music, even iTunes.
And here’s Slacker:
By the way, these videos are dated March 20 so they are new. So yes, Slacker was trying to throw us off by denying that they had a WM app…or T-Mobile has some explaining to do.