My friends at Wirelesstrips.com have added a hotspot finder for recreational vehicle travelers: The rag-tag band of two parents and four kids and some pets roam the country from their base in Maine, and run their various electronic businesses while on the road. Internet access for the Adair-Hoy clan is critical. Richard has used Google Maps open interface to build a mapped directory that shows locations that have Wi-Fi and can handle RVs.
He's working on checking out locations and accepts submissions. His goal is for a directory of places that are really equipped to handle both RVs and offer Wi-Fi, not just those who say they're RV friendly but you can't drive through (a key need) or get Wi-Fi unless you're at the central facility doing your laundry.
There's an alternative interface to the site that lets you specify a start and end point and see all the stops along the way.