Release real-time location data for buses and trains in an open data format. I realize that VTA riders can already access real-time information via the VTA website, 511 and Transloc mobile app, but it would be even better if the data were made open, so that other developers could use the data to create apps.
E.g. BART has released arrival information and service advisories in the GTFS-realtime format: http://www.bart.gov/schedules/developers/gtfs-realtime
GTFS-realtime Specification: https://developers.google.com/transit/gtfs-realtime/