And remember if it is too good to be true it probably is.
Most real estate companies also have their own searchable MLS database. I agree with Mike, you should find yourself a good Buyer's agent who has experience with bank-owned properties. They are handled differently than your regular privately owned homes. The MLS does not separate bank-owned properties from the privately owned ones, but an experienced agent can tell the difference by the information that is contain in the listing.
There are some great deals out there right now, with many multifamily homes with the potential to pay the entire mortgage and expenses from the rents - something that has been difficult to find in the last few years. Be prepared, however, to invest some time and money into the building after you purchase it. In many cases the properties have been neglected, before and after the bank took possession. Look into a rehab loan, such as the FHA 203K loan.
As for selling your home, again, find a local Realtor who can help you fully market your home and expose it to the most qualified potential buyers. This isn't a market where you can just throw up a "For Sale" sign and wait for the offers to pour in. You really heve to work hard to make sure that your home is on every possible internet site, and is properly prepared for the buyers to see. Your Realtor will be invaluable with giving you advice on staging your home, making sure it gets the exposure it deserves, and most importantly in this market, is priced right.
Back to the main point, pre-forclosures are public information (properties still owned by the owner, not yet by the bank, where the bank is starting the procedure to excercise their first lien position due to non payment) and the names of people going into pre-foreclosure across the state of Mass, can be loaded onto a memory card once a week at the land court on Causeway St in Boston. (without a memory card... you better bring a lot of paper and pens because you can't e-mail it ....) It is just the names, so you have to hunt down contact info on your own.
Please keep in mind a good chunk of these foreclosures are investors taking a risk where they failed... this is never a sure money maker, and you should tread extreemly cautiously.