Assist Me(Bronze/Silver) - Edit someone's answer with < 1 score, and then have the answer receive > 3 votes (This will give incentive to edit answers to be more accurate rather than simply downvoting them)
Observational(Gold) - Make 10 comments with at least 25 score each. They must be on different posts. (This is here to go with the 'Commentator' and 'Pundit' badges)
Next Time(Silver) - Create a bounty that will cost you one or more privileges, and have that bounty go unrewarded. (This is basically a commiseration badge for losing a privilege on something that didn't actually get you an answer)
You're Welcome(Silver) and Savior(Gold) - Award 5 and 15 bounties on someone else's question, respectively. (This is here to encourage helping other people get their questions answered)
I believe these five would be good additions to the badge system.