This has been pretty widely blogged about, but since I first heard about it via a Tweet from Carol Margolis, she gets the hat tip. 

JetBlue has reintroduced its “All You Can Jet” pass for fall travel.  Cost is $499 for flights on all days except Fridays and Sundays, and $699 for any day, the All You Can Jet pass is a neat marketing idea to gin up travel in the traditionally slow period following Labor Day.  The pass is good for travel for 30 days beginning September 7th, and is only available for purchase through Friday, or “while supplies last” so jump on it.