When I try to remove a vote older than some (relatively brief) period of time I get this message:
You last voted on this question
X hours ago
Your vote is now locked in
unless this question is edited
I can understand why this feature exists I guess - to discourage frivolous gainvoting. But shouldn't there be some recourse for changing one's mind on the value of a contribution or simply making a mistake and wanting to take it back? Or is there some deeper reason for this feature's existence?