Dear Home Buyer - Just Looking,
If you are at all serious about actually finding a home BEFORE it is already sold, you should interview and select a Realtor to work with and FOR YOU. Your agent will be able to send you, or cause to have sent to you in real time updates to the market, new bank owned properties and all other homes that meet your specified criteria. Flopping around on the internet "willy-nilly" and then asking questions your agent would have already told you is not an efficient way to search for a home. The internet is the perfect place for you to do research but you agent should be giving you real time data on available properties.
In case you were unaware, working with an Professional Realtor as a Buyer does not usually cost you anything but your focus and a drop or two of loyalty.
Best of luck!