Just add "&fmt=18" to the end of the link (without the quotes) and it will make the video surprisingly higher quality o_o
Comparison:
Without : http://www.youtube.com/watch?v=oMtbplem4Hs
With :http://www.youtube.com/watch?v=oMtbplem4Hs&fmt=18
If you already know about this, Good for you but I just found out and thought I'd share :\

