I took my O-Chem full-year-in-one-summer at CSUN (California State University, Northridge). It's pricey compared to the community colleges around here, but it was the best option for me.
I'm one of those odd ones who found Organic Chemistry to be really accessible (General Chemistry was much more of a struggle for me since I hadn't had math in a decade, haha), so I didn't have much trouble with the 11 week session. However, I still had to study A LOT to memorize all the little details. I think it's best to work only part time (or not at all, if you can afford it), and to avoid taking any other classes if you're doing the condensed O-Chem summer.
If you're interested in CSUN, feel free to PM me and I can give you more details.