Cheers :)
The first handful were with a Pentax dSLR and 50mm macro lens, most of the rest have been with a reversed 50mm on Nikon D80 and D7000, some of the higher magnification ones were from a reversed 28mm and a few real extreme ones from reversing the 50mm onto the front of a 200mm (incredibly hard to get results with them stacked like that mind you).
I've started using extension rings lately too, a bit more user friendly than reversed lens in some ways as you still have a nice bright view for focussing - with the reversed lens I'm using the aperture ring to manually stop down before shooting.
Its all manual focus stuff - the reversed lens is basically fixed focus so you just move the camera to get things in focus. I still throw away more macro shots than I keep!