I agree with Matt below. Rental inventory is moving fast in the rental world. I recommend Craigs List for "do it yourself", but would highly recommend you choose real estate agent services to get the most out of your apartment search. Otherwise, you might find yourself wasting a lot of time.
Many of the owner's that were barely hanging on with rental income are now unable to even consider renting because they are joining the increasing list of short sales - good stable units are going fast. I do not recommend searching for private rental units without a real estate agent.