There is a new bus service from Lansing, MI to Detroit Metro Airport called Michigan Flyer (http://www.michiganflyer.com/). I am writing the Blog entry from the bus. It has wireless networking and costs $25.00 each way. This Blog entry details the trip. It reminds me of the bus from Oxford, UK to Heathrow (http://www.oxfordbus.co.uk/airline1.html).
First lesson – make reservations a day in advance. It has a human in the loop. But in a pinch you can pay the driver $25.00 cash and just hop on the bus. I made my reservations at the last minute and had to make a 4:30 AM phone call – everything worked out.