Android Purity is reporting today that the Yahoo! Video Chat app, that is supposed to be exclusively for T-Mobile customers, is showing up in the Android market for non-magenta subscribers. In this case specifically, a Sprint user.
Judging from the screen shots posted, its looks as though opening the app is out of the question, however it seems to be correctly speculated that a bug exists allowing this app to show up in the first place. The screen shot on the left, for comparison, is from my T-Mobile G2 and the screen shot on the right is from a Sprint Evo 4G courtesy of Android Purity.