its already pretty obvious which songs are used way too often, if you've seen some of the more popular frag videos of course. i think a better subject is what is not used enough. i think it would be great to see more hip hop used also some jazz/funk. this song is not only great, but the way its used goes perfect with this video.
http://www.youtube.com/watch?v=RmOPMvDyGQc
I've dabbled in post production work, i know frag videos are just for fun and it gives you a chance to be as creative as you wish. but the one thing that sticks out to me is that people are just way too focused on using some upbeat catchy repetitive electro/drum and bass song, not to say its the most terrible thing you can use (obvious its personal preference what they choose) but it would be nice to see some people be a little more open minded with what music or just think outside the box, and not just the same genre over and over