This is not quite DIY, but it's so inexpensive I thought I'd post it. I was reading Chase Jarvis blog on the Nikon D7000, and they mentioned that Chase used something very similar at some point. What do you think of this, for a DSLR?
http://www.cowboystudio.com/product/c14/p1411-01.php
http://www.cowboystudio.com/product/c14/p1411-01.php