Geo::Google::StaticMaps, which basically just transforms a map definition given as a bunch of nested hashes and arrays into a Static Maps API URL. It ought to support everything that the Static Maps API itself currently supports.
BikeSpike created a handy piece of hardware that easily affixes to any bicycle frame. The device contains a GPS device that can certainly track your mileage or help plan a route; but let's face it, your smartphone can do that much while sitting in your pocket (or underneath your biking tights). BikeSpike's mission goes beyond a simple GPS. BikeSpike offers automatic crash and tamper protection. BikeSpike aims to help users when they are unable to actually ride the bike. To spark further innovation around its hardware, BikeSpike provides an open API targeted at the developer community.