Lots of pictures and ideas. Another large collection of case mod's with links to the individual sites. Similar layout to Virtual Hideout's. Case Modding Gallery Australia's case modding gallery. Good pictures, plenty of idea's.
Site also includes how-to's and online store for case modding supplies.
To's Chick's Hardware gallery with some fine case mod's, and some good how-to's to mod your case. Case Modding Forum Anandtech's forum on Cooling and Cases. Another case modding gallery with links to individual pages. Also has links to individual pages. Another case modding gallery.