I use Linux (Ubuntu 10.04 at present) and have a 60D, but I don't do much post processing. I could not find an open source raw processor that looked OK when noise was an issue. I tried ufraw and bibble (now corel aftershot pro) for a while but couldn't get decent results compared to DPP or the in camera jpg (or even the embedded jpg preview in the raw).
I use DPP 188.8.131.52 version under wine and if DPP didn't work under wine I'd have to consider shooting jpg only or getting a different camera system or operating system just for photo work. There are a few small glitches, mainly related to window management, but all of the functionality seems to work flawlessly. Installing it was a bit tricky, see http://appdb.winehq.org/objectManager.php?sClass=version&iId=7813
I use gimp for occasional editing, and my own file based organizational system and gqview (now Geeqie) for viewing. I'm never going to spend time organizing and tagging photos in a proprietary system that can be changed or discontinued or price-hiked with no way to fully export my meta-data.