Astonshell
Aston - fast, stable, secure and reliable desktop replacement. beautiful themes on your desktop. virtual desktop manager for windows
http://www.astonshell.com
Lots Of Skins
Lotsofskins.com - skins and skins to customize your desktop!
http://www.lotsofskins.com
Skinz.org
Skinz is a user friendly artistic portal which showcases application skins, wallpapers, desktop themes, icons and other creative artwork by users. over ten years online makes this artwork portal one of the most popular online.
http://www.skinz.org
Stardock
Stardock
http://www.stardock.com
Theme Xp
The #1 themes site xp themes, xp styles, xp logins, vista themes, screensavers, wallpaper, desktop themes, windows themes
http://www.themexp.org
Win Amp Skins
Win Amp Skins
http://www.winamp-skins.com/
Wincustomize
Wincustomize
http://www.wincustomize.org