I've asked this question a few days ago, and while Jeff's answer is pretty cool, it doesn't really answer my question. So I'd like to add a bounty to maximize the chances of getting a good answer. I thought the requirement was that the question has to be two days old - is there another one that I'm not aware of?
You have an existing open bounty on this question:
The current bounty system is such that you can have only one active bounty at a time
You can only have one bounty active at a time.
It currently seems you have a bounty live on this question.
Once that bounty has been awarded or expires, you will be able to activate another one.
References you might find useful: