Most of what I do is done with a Canon D30 and four lenses. 28mm, 50mm, 100mm macro and 200mm. 100 macro gets by far the most use outdoors.
When trying to crawl towards a small critter whout disturbing it (and using ground to support the camera steadily), last thing I want is having a Fobus holster slip around the waist to the front. Ops. Had to upgrade holsters.
PS: My Nikon F2, 85/1.8, Canon D30, Canon EOS1, Canon EOS Elan and 100mm macro are for sale to pay for a D60 and a 100 macro USM. Email or PM if interested.