I often hear people say they would like to use public transit more often, but understanding all the schedules and routes is cumbersome and time consuming. If you rely on public transit every day, you are obligated to learn the system, but if you are just a casual user and want to include public transit as one of your many options for getting around the city, I believe a tool like Google Transit could help.
Here is an example in Seatle.
UPDATE Word from RIPTA is that they have submitted their information to Google and are in the process of getting the system running. Hooray!!