I would like to share of my newest ideas. Maybe You'll be interested in and get involved.
I imagine the (Google) Travel Guide as an application for tablets or mobile phones (Android) which would remind you the road navigation. However it would have a bigger range of options like destination details, information details or topic suggestions refers to proper place. On top of that the route would looks colorful due to many various topics appropriate to the region. Unlike to navigation this application would provide you a lot of information about your current position and entire trip.
I hope that my idea will support the touristic world in the future. Now everything is based on theory only. To implement this into the life we need prepare a huge stuff of data and create a proper software to use.