I'm new and would not have thought I'd enjoy the macro as much as I do. I've got some ext tubes on the way to try some of this. Are you using that 565ex there, or how did you do your lighting?
The extension tubes are just no-name brand medium quality with electrical contacts that I found on ebay for around $40/set. I didn't use any lighting, it was full sun out when I took these, so no extra light was necessary.