There are probably a dozen ways (Kinoma, CorePlayer/TCPMP, etc.), but Google has a free YouTube app for Windows Mobile -- or did. The url for it, http://m.youtube.com/app gets a 404 error, even though I downloaded the .cab from it a couple of days ago. It's still available on one of the official HTC wikis, but I've posted here.
I won't have the 6900 I purchased from eBay for another day or two, but it works great on the Treo Pro, so it so look even better in QVGA landscape mode.
Me and my friend have set up a Youtube account together but we are not sure what type of videos to put on there, we are both girls but we can't think of anything that would be appealing to people, and also how can we get ourselves well known?
Oh and BTW We both have webcams and microphones.