I use Gentoo, and dualboot to windows for Lightroom
I've not found anything close to Lightroom in Linux, one day I'll replace my PC with an Mac and get the best of both worlds.
LightZone looks like a nice piece of software (for windows, mac, and linux) , but doesn't have much in the way of organization - if you are ok with using something else (fspot is decent) for that, you might want to look into LightZone