I have found the most success with RealtyTRAC . I subscribe to their website and get alerts during various stages of the foreclosure process. I noticed today that Trulia is starting to post "pre-foreclosures" as well. But as Susan pointed out, the courthouse would have the most accurate records.
Marian Mercer, Realtor
Southern Homes and Land Real Estate
201 Commerce Park
Rincon, GA 31326
(912) 536-8945 - cell