I use the MLS listings on the OC Register site and then call the listing agent if I want to see it. Nowadays the response is usually "when do you want to see it". There doesn't seem to be a lot sales volume out there. When I prove to them that I am someone that owners would like to rent to then the treatment gets even better. They must get a lot of pretenders because it does make a difference when you show them a paystub and recent credit report.
I also of course heavily use the mapping services, especially the birdseye view on Yahoo and MicroSoft Earth. I find Google earth to be too cluttered and often inaccurate.
All that said if there are properties for rent that are not MLS or Craigslist I would pay a realtor to show me those. In my DIY approach I may be overpaying. I am currently paying $3,000 for 3BR, 3BR 2,100 sq ft in Woodbury.
I would also appreciate a realtor on my side in a rental search. I get the same BS that realtors spew when trying to sell a home: "hurry there are already several offers" blah, blah blah. Yeah, right, there are so many people out there looking to rent for $3k.
IR2, my rental contract is up and I am currently month-to-month. I am looking for a 3BR that has an office, at least 2,100 sq ft, near both Elementary and Middle Schools.