There have been talks for quite sometime of building a people mover or personal rapid transit system (PRT) connecting San Jose International Airport to existing and future transportation systems. These would include Light Rail, Caltrain, and even BART.
Today I stumbled upon an image of a potential route around SJC from the smart growth/planning site Cities21. Click on the image to see the full map. This might be a wild dream, but I'll be the first to celebrate if anything close to this actually comes to fruition!
Below is an example of what a PRT system "car" could look like. There are already some PRT systems in place around the world (West Virginia University, London Heathrow Airport, etc.).