I've posted a few photos taken with various new macro gear:
http://www.pbase.com/sayer/lens_test_macro

The plan is to figure out what works best early in the season. A
very cool lens I bought is the Canon 65mm MP-E 1-5X macro, which
allows a magnification range between 1x (life-size) and 5x. It also
offers some challenges like what type of flash system will provide
enough light on the subject at a working distance of an inch or two
without creating too much harsh reflection.

I also bought the Sigma 180mm macro lens and Sigma ring flash. So
far this combination has been a challenge. The ring flash tends to
create harsh light and glare on the subject. Previously, I used the
Sigma 105mm macro lens with the Canon 420EX flash in the hot shoe
and diffused the light with a Lumiquest Softbox. The new 180mm lens
is too long to use the 420EX flash in the hot shoe for close/small
subjects. The lens gets in the way of the light provided by the
flash.

Next steps are to see what flash bracket options will allow the
420EX flash to be used away from the camera shoe mount and decide if
I will keep or sell the ring flash and 180mm macro lens.