• InterfaceLIFT Icons
  
• IconFactory
• Pixel Girl Presents
• ResExcellence
• David Lanham (click on tiny icons at left)
• guiKit Icons
• Railhead Design Icons

Desktop Pictures:

• Mandolux
• Caedes
• InterfaceLIFT Wallpapers
• Pixel Girl Presents
• Veer
• Patrick Bennett
  
• ResExcellence
• Flam3 (fractals)
• Weather Photos
• MacDesktops
• DeviantArt (the Apple section)
• Sports Cars
• Skins.be (celeb skin)
• Vlad Studio
• Digital Blasphemy
• Twisted Sun
• David Lanham (click on tiny icons at left)
• guiKit Desktops
• Flickr (1) (2) (3) (4)
• Some panoramas (for multiple monitors)
• Don Synstelien
• Atacama Design (some widescreen)
• My Desk City (Chinese, but hi-res)
• AquaSoft
• Railhead Design Desktops