Here is one for us jetsetters...ha ha!
http://current.newsweek.com/budgettravel/2009/08/jetblue_offers_an_allyoucanfly.html
As usual it comes with a lot of catches:
Non-refundable, non-transferable, and non-auctionable. If you book a flight and then don't show up, you'l be hit with a $100 fee, though you have up to three days prior to a flight to cancel.