I have about 3000+ wallpapers.
I'll contribute to the dump (I have about 300+ uploaded to mediafire).
All i like is the PS3 Control one
Computer wallpapers / wallbase.cc
Search by keyword, resolution, color, etc etc. Hands down the best wallpaper site around. Lifehackers Wallpaper Wensdays sometimes have a couple good ones, but rarely. I might post a few of my walls too if I can get around to it.