Find GPS location of client browser

http://blog.walisystemsinc.com/2012/02/html5-geolocation-and-sharepoint-2010_20.html

http://www.codeproject.com/Articles/31965/Learn-How-to-Find-GPS-Location-on-Any-SmartPhone-a

http://www.codeproject.com/Articles/8128/Writing-Your-Own-GPS-Applications-Part-I
http://www.codeproject.com/Articles/9115/Writing-Your-Own-GPS-Applications-Part-2
http://www.codeproject.com/Articles/28528/Writing-GIS-and-Mapping-Software-for-NET


http://gps2.codeplex.com/
http://gps3.codeplex.com/
http://geoframework1.codeplex.com/
http://geoframework.codeplex.com/
http://dotspatial.codeplex.com/

http://www.paulund.co.uk/how-to-use-geolocation-api-with-google-maps
http://viralpatel.net/blogs/html5-geolocation-api-tutorial-example/

http://www.geoplugin.com/examples

http://stackoverflow.com/questions/409999/getting-the-location-from-an-ip-address
http://krister.fi/jquery.geolocator/
http://www.9lessons.info/2011/06/geo-location-with-html5-and-jquery.html
https://github.com/manuelbieh/jQuery-Geolocation

http://tympanus.net/codrops/2012/10/11/real-time-geolocation-service-with-node-js/

For old browsers below posts have some useful hints:

http://msdn.microsoft.com/en-us/magazine/hh580735.aspx
https://github.com/estebanav/javascript-mobile-desktop-geolocation