This auction on Ebay is where I got the idea. I already have a laptop that I could use though, so it shouldn't be nearly this expensive to get the needed software/adapters.

http://cgi.ebay.ca/OBD2-OBDII-Diagnostic-Laptop-for-BMW-Mercedes-VW-etc_W0QQitemZ220011057591QQihZ012QQcategoryZ30921QQssPageNameZWDVWQQrdZ1QQcmdZViewItem