Good News: Starting Tuesday, JetBlue is testing a new system that will let you check email and use IM while in the air.
Bad News: You can only use YahooMail and YahooMessenger, or your WiFi-enabled Blackberry.
I would be wiling to pay, hm, maybe up to $15 extra to be able to use airplane WiFi that accessed the entire internets. Crackberry and diddlymail (Yahoo) users will be thrilled. The rest of us will have to wait.