Having tried the latest version of the app I could find, it worked but screwed up the Media Player in the process meaning I could no longer play MP4 or 3GP files from the HTC Album. Only way I could sort this out was to do a hard reset.
So far I can only get Youtube to work from the web, the quality of which is shocking, or from CorePlayer which is equally as bad.
Does anyone know where I can get the Youtube CAB that's specifically written for the Touch Pro 2? The rest I can wait until a decent ROM is written then I'll unlock and flash the phone but Youtube I can't live without!