PS3
http://www.mcps3download.com/categor...map-downloads/

XBOX 360
http://mcdn360.com/

PC
http://www.minecraftmaps.com/
(There are a few more for pc I believe but here is the top one)

I hope this helps
if you guys download maps I suggest you try and upload too. It will motivate others to make more and upload as well.