A new light rail system will open in 2008 for Phoenix, Tempe and Mesa. It crosses Tempe at the north end of the Mill Avenue district. There will be a station at 3rd and Mill. It was already only 8-10 minutes to the Phoenix International Airport from downtown Tempe, but soon you can take the light rail and not even have to park your car.
Easy in and out through Skyharbor Airport in Phoenix, Arizona. 10 minute cab ride to downtown Tempe.
Free shuttle (FLASH) around town of Tempe during the week serves areas around the University (Arizona State University). Standard bus serves entire Phoenix Metropolitan area. No subway...but light rail in the planning stages. Great bike trails through desert parks and along 180 miles of canal.