I was looking at stack overflow and thought these were really cool features.
Profile views are just a minor thing that might be cool to have, just like question views.
Badges can be like Steam/X-Box Achievements, except without any "gamerscore" (points) added. Just a nice little thing to have. Although instead of calling them badges, I suggest calling them Medals, after the medals in BW2.
The other two are more of aesthetic features that serve more of a fun purpose. Bounties are something I really want. http://stackoverflow.com/privileges/set-bounties
We could have a tab in Unanswered Questions that is for Questions With Bounties. Although, I would rather not have a maxiumum time the bounty is available for before being rewarded.