I couldn't find any success stories on the forum, but I have seen some go through off line through lawyers and Realtors. It may depend on how good and aggressive your agent is and if they are good (they want that commission, they will make sure they close the deal).
You may want to read a few posts I have on the subject of short sales to make sure you are covered on every legal base.
Negotiating Deficiency is Key in a Short Sale IRS Tax Laws on Short Sales Short Sale Tips