Fares are pretty standard in this re-run of a previous sale. Only the sale dates have changed. $49 to $159 each way, depending on travel days and routes.
Purchase January 27 through February 19, 2009, 11:59 p.m. Pacific Standard Time. Travel through May 20, 2009. 14-day advance purchase is required. Travel not available to/from Florida, Washington (Dulles), DC, Orange County, CA. These fares are available for one-way travel. Available only on southwest.com and swabiz.com. Seats are limited and won't be available on some flights that operate during very busy travel times and holiday periods.
Without a doubt, other airlines will match or beat these fares on most routes.