Megabus, the discount bus line, is offering 100,000 free trips to "promote public transportation as a way of curbing carbon emissions." The trips must be taken between Jan. 16 and March 11. There is a .50 cent ticketing fee per reservation. Use Promotion Code: WIN2008 at http://www.megabus.com/For example, on a red-eye ride, you leave SF Cal-Train Station 1130pm (Megabus pickup point) and arrive L.A Union Station at 615am.
Might be an interesting alternative to a flight down to LAX