View YouTube Videos

It is possible to view YouTube videos off their website without using their mobile site, where the video/audio quality is not as good. You just need to use TCPMP and the FlashVideoBundle to do so, and then it adds a nice context menu when you click on a video on YouTube's site that lets you save the video to your phone as well. You must make sure you're on the regular or classic version of the site, not the mobile one.

TCPMP is also useful in that it plays a lot of different video formats well.

There's an excellent step-by-step that works for Windows Mobile 6.0, 6.1, and I think even 5.0 here.