This looks interesting, how long have they had the free shuttles?
http://www.changiairport.com/changi/...torcenter.html
Free City Shuttle to Town
Passengers connecting at Terminals 1, 2 and 3 with at least six hours to spare in transit can, subject to visa requirements, take a free city shuttle to Little India, Suntec City or Bugis Street. Departure schedules are available at the visitors centers.