We caught word a month back that T-Mobile was planning to roll out an 'App Store' similar to that other App Store that would be available to all phones on T-Mobile. Well, that news has changed according to mocoNews, it looks like Android devices (and the Sidekick) won't have the T-Mobile App Store when the app store goes live. But don't fret, T-Mobile is still planning on eventually including Android just not when things are so green.
In any case, when the T-Mobile App Store launches it'll probably feel more like a beta since T-Mobile won't allow API Access or allow free apps to use advertisements. So I guess we won't be missing much, it's better to get all that trial and error out of the way before it reaches our Android handsets.