hey ethan, i would just IM you right now but i don't feel like turning my away message off, so... i'm leaving a comment. ;) (i know, i'm stupid.) but i found this link and thought it was interesting, and maybe you will too:
http://www.macdevcenter.com/pub/a/mac/2004/05/11/photo_hacks.html?page=all
Keyboard Shortcuts: Left arrow = previous photo, right arrow = next photo, R = random photo
http://www.macdevcenter.