It looks like Google just added Austin, TX to their list of cities:

http://googleblog.blogspot.com/2007/03/music-movies-mayhem-and-metro.html

I wonder what's taking so long for adding more cities? It looks like Chicago may be coming soon, as I just noticed that the Google Map now shows different train stops:

http://maps.google.com/maps?f=q&hl=en&q=Clark+and+Division,+Chicago,+IL&sll=41.8987,-87.641845&sspn=0.023031,0.040169&layer=&ie=UTF8&om=1&z=16