This KML network link displays the maps from http://2gis.ru/ as an overlay in Google Earth. 2gis is a Russian company that grew out of a busines directory service and that now offers free online and offline maps for all major Russian cities (http://ru.wikipedia.org/wiki/2GIS).
For some information on how it works, please see the main page and the FAQ.
To get started, simply download all 6 European Maps map overlays on this site.(please log in first, see here why) and open it in Google Earth. Or checkout
Do you have comments, bug reports, or suggestions for other map sources? Please leave them below.