Oh boy, David, nice collection you have! Interesting tread and will be great to see what others use.

I use the Canon 400d camera.
I have the EF-S 17-85mm f/4.0-5.6  IS USM
I have the EF 100mm f /2.8 macro USM
I also have  the Lensbaby 3G

I do have the EF 75-300mm  f/4.5-5.6 III zoom lens. I don't like it just doesn't doit for me. Too slow and a picture is not a good quality. So I would like to replace it with a 300mm prime in a future and add a fisheye lens to my collection.

Ronnie. I did reverse my lens before I bought a macro. Was fun to fiddle.

seeyus  Tunde