I was playing around with some super-macro stuff this morning. An article in this months issue of Audubon about flies inspired me a bit, so I dug out a cheap old metal extension tube, taped a standard 50mm lens backwards, and headed to the backyard. Seems like a goofy set-up, but it works well. The images are id'ed as best I can based on the books I have...

Repetitive Tachinid fly

Circumpolar Bluet
Flesh Fly

Green Bottle Fly