JetBlue has a new sale out today called the Hot Fares Sale, while not all fares are hot, there are some deals to be found. This is a typical JetBlue sale, very similar in pricing to the ones they've had in the past couple of months. Most deals you will find will be out of their focus cities, New York (JFK), Boston (BOS), Ft. Lauderdale (FLL), and Long Beach (LGB).
These fares starting at $39 one-way can be booked for the travel window of January 18 - April 6, 2011. Travel any day of the week except Friday and Sunday. Black out dates are February 17 - 28, 2011. (School vacation week). Other blackout dates of note are to Austin, TX from March 11 - 20, 2011 (SXSW music festival). Book before midnight January 13, 2011.
Sample fares include: