Sorry for the late response.
Kevin nailed it on the flash part. Off-camera flash illuminating the subject from the side, and manual mode since my Canon's E-TTL system likes to think waaay too much. I shot these at like 1/200 @ f/14 or something ridiculous, the flash put out everything it had to illuminate the subject but because it fired from the side did nothing for the background so it was black.
Equipment: 10D, 100 macro, 500D diopter, 1 extension tube, Canon 420EX flash with off-camera flash cord. The part of the OC flash cord that mounts to the flash conveniently has a tripod mount (read: threaded hole) so the flash was on a separate tripod from the camera. Gee, no wonder I paid $50 for a 2-foot wire with a hotshoe at either end. LOL.