Anime Revolution
This site has some pretty damned gorgeous banners, backgrounds, and Winamp skins. Go there.

Ai no Kaze
An interesting assortment of desktop wallpaper for various series, including a lot of Utena ones.

The Clamp Warehouse - Clamp Wallpaper
Okay, so there's no Utena stuff here. I still like her work.

Paperthin Pleasures
The likely source of many of my Yami images.

theria.net | Yami no Matsuei
One of the better information sources on YnM.

Sakura-Crisis
Scanlation site that does YnM, Count Caine, and much other stuff.