SAS.Planet
This program allows work with any maps service if you can describe getting picture by longitude/latitude(if you want you can write config file or simplepascal script to describe how obtain needle photos). "In package" program supports many "main sources"("maps" in main menu) such as GoogleMaps, VirtualEarth, Yahoo satellite photos etc(some part of maps are local - for Russia, Ukraine and Belarus) And there are functionality of "layers" - sources that can been used independently and simultaneously(Wikimapia, Water resources, Panoramio etc). Also there are placemark manager, possibility to work with connected GPS-device, exporting layers and batch loading. Program is portable and has own cache so it can works offline.
