Instead of all of the youtube cover topics, here's an official one. feel free to just post any covers you like/dislike that you found on youtube and tell whether its supposed to be good or bad so people know what they are about to watch.
I'll start off with some that i found........
Good....
Adam's Song (Acoustic) - great voice
http://www.youtube.com/watch?v=8k3utymTZf4&mode=related&search=
Violence (full band) - drummer is fucking insane! They sound really young, but are still hella good
http://www.youtube.com/watch?v=goZRtvuQ5Ps
Bad.....actually the worst cover i've ever seen.......
Anthem Part 2 (full band)- doesnt sound like anyones been playing their instruments for more than a few hours (except the drummer), and no idea whatsup with the singing, i think he is deaf
http://www.youtube.com/watch?v=se_4g-zM884&mode=related&search=