http://indulgd.com/realistically-colorized-historical-photos/

Beautiful collection of images that people have added realistic (although some strange colour choices on a few!) colour to early photographs.

It is amazing how we are so tuned into to colour photography now, that the additional tonal information can make people and places seem so contemporary.

Links:

http://forrifarg.se/?lang=en

http://dynamichrome.com/
Some lovely photos here

http://valdigtmycketfarg.wordpress.com/