I've been using this site for years http://worldcoingallery.com/index.php Its a nice site for looking up foriegn coins and the pictures have great detail. The only bad thing about the site is if you dont know what country the coin is from, you have to search through 1000 pages of coins looking for what you want.
I just stumbled across this a few minutes ago http://worldcoingallery.com/Inst-ID/index.html It shows some general identifying marks to help find what country its from. A real time saver!