You can always get a shared mini-bus from the airport that will take you door to door. There not usually much more than $15 or so.
Only problem is you might be the last person to be dropped off so it can be a long ride.
If you go to the transit counter they will book it there and you hang around until the driver comes in and calls you.
After one really bad experience of this I am now a convert to the AirTran, and LIRR, taxi option.