Canonlaw: I put a link in here to Supershuttle:
http://www.supershuttle.com/was.htm
They have been hit or miss with me. Just one piece of advice: if you are paying with a credit card MAKE SURE YOU CALL THE DAY OF DEPARTURE TO CONFIRM AND REMIND THEM YOU ARE PAYING WITH CREDIT CARD. OTHERWISE THE DRIVER WILL FORGET THE SWIPER!
And here's an old trip report on my SuperShuttle Experience in Philadelphia:
http://www.flyertalk.com/forum/Forum81/HTML/000247.html
[This message has been edited by Catman (edited 11-27-1999).]