Redwood Coast Transit (for Del Norte County, CA) is now live on Google Transit.
RCT operates two Route 20 round trips between Arcata and Crescent City Mon-Sat. The service connects with Redwood Transit System's mainline service and Willow Creek service, and with Arcata & Mad River Transit service.
Google Transit allows passengers to seemlessly plan travel itineraries. Here's an example itinerary from Henderson Center, Eureka, to Crescent City.
Among the many uses for RCT's transportation service, I've used the bus to bike tour through Redwood National Park (actually, this trip was part of the data gathering project for Google Transit implementation). Highly recommended trip.