I think it's only for HTC phones, but it doesn't currently show up under HTC Apps, and curiously can't search for it. I found it by navigating to marketplace/apps/music & videos/new/YouTube[HTC Corporation] So far UI is nice. The good: Stand alone app: not browser links Smooth transitions. Video quality options: HQ or Fast Download. The bad: Limited share options: at the moment, only can share via email, no Facebook, etc. You still need install MS version to play FB videos.