This question had a bounty worth +250 reputation from XXX that ended 10 mins ago.
Is there a delay between the end of the bounty and the bounty being autoaccepted and awarded? I didn't read the FAQ description as indicating anything like this...
In June 2011 things changed, and it now takes at least 24 hours†, during which the bounty can still be awarded manually. (To answers that were eligible when the bounty expired.)
† Actually, it's even 25 hours on regular days when daylight saving time doesn't start or end. So, it could even be 26 hours!