The youtube-dl script supports sites besides youtube. Problem is that it must have code to handle every site it supports and some sites like to change their hashes every week to break downloaders.

Read the authors section at http://rg3.github.com/youtube-dl/about.html for a list of supported sites.

http://code.google.com/p/get-flash-videos/ -- if you have perl on your tablet you can try this script, it might support sites not supported by youtube-dl but you'll have to go look.