Have a developer unlocked phone? You can get the XAP for the YouTube app from Microsoft that was pulled by Google.
Metrotube and myTube are by far some of the best options in the Windows Phone Store right now if you want to get your YouTube on. There was a brief period of time where Microsoft’s own YouTube app was killer, before Google had it killed. Now it’s a shell of its former self and not exactly an app we’d recommend to anyone. Miss that great YouTube app that Microsoft put out? There are ways to get it back. Details below.