Yes, the ability to undo a vote would be useful. Shouldn't be that hard to implement, either, given that the site already keeps track of who has upvoted what.

Yes, the ability to undo a vote would be useful. Shouldn't be that hard to implement, either, given that the site already keeps track of who has upvoted what. I have also noticed that pg's comments have unusually high ratings, whether or not the actual content was unusually good.