Heh, no problems, man!
I like the official youtube player better than HTC's, even if the quality is a bit lower. As the video runs, a .flv file is dumped into one of your temporary internet folders. If you stop the video just before the pink bar (not the full red one) gets to the end, you can copy the file out of the temp folder to your sd card, rename it, and watch it whenever you want with tcpmp. It can be tricky stopping the vid at the right moment, though. It's easier if you empty your PIE cache first.