Is there Adobe flash 10 for KDE? I have an N800 and KDE is cumbersome without a keyboard but it would be something to consider.

A small wine app that would just run Adobe 10 would be another possibility if it wouldn't be too processor intense.

I rarely try to watch online videos on my N800, so I won't be holding my breath. I have converted a few of my daughters favorite movies to avi to watch offline.