Sorry if this has been mentioned earlier, but I find that my flash video downloading needs are perfectly fulfilled by these two excellent programs from marxian:

cuteTube (and cuteTubeQML)

QDL

I use cuteTube to download YouTube, DailyMotion, and Vimeo videos.

With QDL you can download flash videos from many other places in addition to those. You just need to install the plugin for the service that you need to use, which is also provided by marxian (plugins are distributed now in separate packages for maemo, whereas before there was just a monolithic package for the program and all the plugins).