It might just be me being retarded.. but...
my HTC Touch Diamond had a YouTube client out of the box... Which also works umm.. pretty flawlessly.
Video-sharing moneypit YouTube has launched a new mobile client, for S60 and Windows Mobile devices, providing mobile access to more than 30,000 videos of dancing cats. Most mobile access to YouTube has been through a limited interface which links to the on-device media player for playback. We've never had a lot of luck …