There’s an active Google Transit development community, both professional and amateur. I just read this announcement on the “Transit Developers” Google Group:
I’m happy to share with this list details about a project I have been
working on to help facilitate sharing of GTFS (Google Transit Feed Specification) Data.
The site will collect as much transit scheduling information as it can, including both official and non-official feeds. The idea is that as GTFS becomes more of a standard for presenting schedule information, developers can write schedule presentation software (hopefully open-source) and this site would be a place consumers or software developers could go for schedule information for their transit agency, in an open format.
Thanks to Jehiah Czebotar, who announced this website.