Whatplug

Below you can find all types of  sockets (first row) and plugs (third one). In the middle you can see adapters.

www.europlugs.com

Plugs around the world:

http://www.worldstandards.eu/electricity.htm

Voltages around the world:

http://www.worldstandards.eu/electricity.htm#voltage

If you are looking for summarizes information on the electrical systems in use in most countries of the world - check this website: http://www.kropla.com/electric2.htm