Beginning December 11, (just in time for the holiday rush) JetBlue Airways will be offering a free limited e-mail and instant messaging service on their flights. But don’t get too excited quite yet – web surfing and downloads will still be off-limits due to broadband limits, and the only mobile devices that will work with the service are BlackBerry models 8820 and Curve 8320, and laptops are limited to Yahoo email and instant messaging. Thankfully, the air carrier’s partnership with Yahoo! and BlackBerry isn’t exclusive so deals with other email systems (Gmail, please!) is a possibility. The trial run will start with Flight 641 from New York to San Francisco.