I have a decently large collection of VGA backgrounds, mostly from diamond background threads on XDA, but a handful from other sources as well, so I figured I'd share them. I don't take any credit for any of these pictures, all I've done is collect and repackage them.
http://ppc.baf.cc/probgs.zip - 34.5 MB of backgrounds for your viewing pleasure, and you don't even have to deal with rapidshare.
Everyone else, post your backgrounds here as well!
Here is a list of all wallpaper packs uploaded/linked in this thread:
BAF's 34.5MB backgrounds, mostly from XDA
bwhite4801's collection of mostly nature and scenery with some abstract photos., and a
larger, updated pack
Cool wallpapers at XDA
Automatic wallpaper changer
Boo Boo's military wallpaper
freeza's zip file of 1,136 wallpapers, most of them are from the website interfacelift.com.