http://youtu.be/GD08oqylYOk

This video is a good mash-up of recent songs.  The guy singing usually does replacement vocals for censored songs.

Violin Dubstep

http://youtu.be/H_5j0uzlYfo

I like this video because it shows that classic style music instruments can keep up with changing trends.

Brain Games

http://youtu.be/PN1NAiM55hU
This video is how images can fool your brain.  Very interesting.

http://youtu.be/7OUM1Yy6glM

This is a good behind the scenes video of the oil spill.  Very good visuals.

http://youtu.be/vyp8yqSg17c

I really liked this song.  I first discovered it facebook. Really good lyrics.