The RTA has just released a site you can pull up on your internet-ready cell phone to help plan your trip in the Chicago area. Just type in the RTA Mobile website (www2.rtamobile.com) and you'll find a fairly familiar screen of options (time, day, starting and ending address) to fill in to figure out the best route. The problem is that, unlike the CTA's current online trip planner, you can't select from a set of popular destinations if you don't know the address of, say, Midway Airport or Navy Pier. There are plans for access to bus and train schedules through the RTA Mobile site in September, but until then, better start memorizing some addresses, or just call the RTA up at 836-7000.