"Live TV" is actually a Jet Blue product that they sell to other airlines.
http://en.wikipedia.org/wiki/LiveTV
Of course it is easier for Jet Blue to take delivery of their new jets with new technology. It is much harder for American, Delta, NorthWest and the other airlines to similarly equip 20 year old jets.
Someday, Jet Blue's airplanes will be older and everyone will wonder, why can't they have the features Continental Airlines' 787's have.