I've been doing these for years, but I guess now's a good a time as any to share them here. I do what are essentially mood pieces, pulling video together with audio tracks I like and highlighting zones and raids I prefer. I have over 25 at the site, but these are a few of my favorites:
"Markers" (compilation of memorials of both NPCs and players):
http://www.youtube.com/watch?v=bb2ux1fLmJM
Darkmoon Faire:
http://www.youtube.com/watch?v=ZeFs21H41-E
"Road to Ramkahen" (Uldum):
http://www.youtube.com/watch?v=PoyfwVBeEnE
"Tower of Karazhan":
http://www.youtube.com/watch?v=XRC5PJowdQU
Full site is at http://www.youtube.com/user/DrOtto and as alaways, feedback is wanted, needed, and preferred.