Well grabbing coffee is always available, and summer is always a big time for post. If you have legit FCP skills, especially on the organizational side, you stand a good chance of finding work as a Post PA, Logger, Digitizer, or even Assistant Editor with enough digging. If you have broadcast credits, a Junior Editor spot might even be possible.
Craigslist is ok for some work. I would look at Production Notices LA, realitystaff.com, mandy.com, entertainmentcareers.net, and crew-net.com. If there is a specific company or post house you want to work at, feel free to give them a call yourself and solicit. Worst case scenario, they say no. Can't hurt.
Eddie Doty