Google has activated directions using public transporation for the whole state.

http://www.gcpvd.org/2008/04/23/google-transit-rhode-island/

It works pretty well, although the routes drawn on the map can be a little suspect from time to time (ie, showing straight-line paths between points, rather than following roads). The times all seem correct, though, so it is very usable. With one fell swoop, Google has just made RIPTA even more awesome.

Next year for Earth Day, they should include bike paths and greenways in their directions...

Peter