I'm probably in the minority, but I don't know think badgeville will be as big as people think it will be. Sure it's kind of cool to earn little badges and unlock achievements, but it seems too gimmicky for me. Right now people are trying to "game-ify" everything like it's a magical pill that makes everything boring super exciting and addictive that people can't stop. They say the whole point of adding these features is to drive user engagement up on the site...or to focus users on the tasks that website owners want. If that was the case as a website owner I'd give out badges and virtual prizes for clicking on ads. "You just unlocked the ad clicker badge!"
Aside from that it seems silly after a while when the make the barrier so low to gaining badges and achievements. Once you start rewarding every little thing it starts becoming less meaningful. It's kind of like getting those Certificate of Participation awards at a science fair. Sure you got an award, but you just had to show up.
Next thing you know badgeville will try to expand into human behavior...creating achievements, points, and badges for every day human things. Stuff like Showering 5 Days in a row badge, Nose Picker badge, and Poop Twice a Day badge... Now that I think about it THAT actually might be more fun.