I shop at Drs. Foster and Smith for some of my pet supplies. I just noticed that they carry an adjustable stand you can hang a brooder lamp from: http://www.drsfostersmith.com/Product/Prod_Display.cfm?pcatid=6192&N=2006+113030 Most people wouldn't need this, but once in awhile I see somebody that is really having a problem hanging their light indoors. So, I just thought I'd post this. I guess it's in the same category as MyPetChicken.com and Eglus. Not the most common choices, but just right for some. They also started carrying a clip on lamp, that has a built in dimmer. All of these are in the reptile section of the web site.
It would be very useful in a number of different settings. I frequently have different groups of brooder babies and need adaptable heat sources so I use a lamp on a metal tripod that can be raised and lowered and angled. That especially helps when I want to heat one of the stacking brooder cages or a dog crate. chel