Public Feeds wiki page on Google Transit Data Feed Google Code project
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|Marked since Aaronantrim|
As of November 2015, the above page has been changed to read-only (due to the discontinuation of Google Code) and mostly exists for historical sake (the source code for the project has been moved to Github, and it appears the GTFS list of agencies did not make the transition).
The list is currently maintained on this wiki at Publicly-accessible public transportation data