http://bwgame.com
the site is VERY VERY slow, not sure why...
Basically black & white is a god simulator, you play the role of a god, you have to convert worshipers, use your powers to perform miracles, and take over other god's territories. You also get a pet creature ( what the screenshot was of) which is basically the "jesus" to your "god", you can teach him miracles too, get him to perform tasks, and impress villagers. etc.