If you enjoy FMA AMVs, here are some of the best (Disclaimer: I haven't made ANY of these):
YouTube - FullMetal Alchemist - Motivations "Through Glass" *Spoilers*
(Insanely awesome FMA AMV to "Through glass" by Stone Sour. My all-time favourite AMV.)
YouTube - Be Prepared for Roy
(This made me laugh so hard I almost cried. "Be prepared" plus Roy equals awesomeness.)
YouTube - Full Metal Alchemist AMV - From the Ashes
("Hollow" by Submersed. Very well-done)
YouTube - It Only Hurts For Mello
(And on a completely different level, here's a Death Note AMV, Mello-centric. "It only hurts" by Default.)
Hopefully I put the right links in.