Youtube on non X86 platforms.
I know cross-posting is frowned upon but I just discovered a useful item that you may like to try.
The above link is a Greasemonkey script that plays Youtube movies through MPlayer. You'll need MPlayer and the MPlayer Mozilla plugin as well as Greasemonkey installed to use the script. I'm using the unofficial Marilliat MPlayer on Etch AMD64 and it works fine for me!