I work for Contra Costa County Library, and can tell you that we have just improved our digital services. During the Reading Festival we even had the Mobile Digital Library at a couple of events. Use the little icon on the library's home page (
ccclib.org) as the URL for the digital area is too long.
It sounds like you are coming down 80 on your way to SF for your library roadtrip. Check out the brand new Hercules Library just off the freeway (
http://ccclib.org/locations/hercules.html). The design of the building is awesome and the collection and equipment is state of the art.