I gave up on UKTUBE and got an N800 instead

Some sites have a simple file structure to grab the .flvs.

On one of my fave video sites, maniacworld.com, you simply insert or replace with "flv" in the URL to download the Flash vids to view on MPlayer.

exp. -you select a vid on the homepage and the URL goes to this:

www.maniacworld.com/chosenvideo.html

you bring up the address window and cursor into it to make:

www.maniacworld.com/flv/chosenvideo.flv

and you will get a download prompt for the actual flash vid.

Also, for your "big computer" the Firefox browser has a "Download Helper" add-on that really works well to automatically cache and download nearly anything.