Man, I LOVE my old lenses on my 'new' cam.
I just spent about 3 hours in the garden taking macro photo's. Besides fun it's also a good physical exercise. Getting on my knees to get close to the small creatures and getting up again for the bee's and butterflies and bending backwards for the pondskaters. All this with the sun shining and a cool breeze,... what better way to spent the day.
I got some relatively cheap lenses from Canon. I mainly use the FDn 50mm f/3.5 Macro on my Canon 5D with a converter without optics. The quality of this lens is amazing!
I can't wait to get out again!