gvSIG Mini is an open source map viewer intended for Android and Java mobile devices. v0.2 for Android devices has just been released. gvSIG Mini supports viewing of various free tile sources (OpenStreetMap, YahooMaps, Microsoft Bing), WMS tiles, address search, POI (point-of-interest) search, and routing.  v0.2 adds support for:

• WMS and WMS-C layers
• Compass sensor
  
• GPS/Cell geolocation + location precision display
  
• Navigation mode
• Share your location with Twitter, SMS, Email, Facebook,etc
• Download efficiency improvements
• Street View
• New layers: Ordnance Survey (UK), PNOA (Spain), Yandex (Russia)
• Various user interface improvements including "Quick Zoom"