Put the camera on a tripod (yes I have one of those) and went out on the deck in the backyard to practice. Not totally sure I have the off camera TTL stuff down, but it's got huge potential for adding pop to outdoor images with minimal weight - 580s are much nicer to carry than Alien Bees and Vagabonds...
Setup is 2 580EX IIs off camera - one on a stand, one in my hand, and a ST-E2 on the camera.

Exif:

I likey.
