There's a story on the Israeli news site "ynet" that El Al just signed on with Boeing to install Wi-Fi access on its fleet of 744's and 772's.
They say installation will commence in June 2005 and be complete by the end of 2006. Expected cost: $10 to $30 for the duration of the flight.
I just hope they DON'T enable cell phones. Its one thing to e-mail, surf and IM - which everyone can do privately and quietly. Cell phones will cause havoc, especially on long-haul flights.