Aha! I wasn't even a member when that node was posted, and it's an interesting concept. I couldn't help but respond. I think discounting "late" DOWNvotes is a good idea, as a) presumably the author has learned his lesson (assuming there are already several other downvotes), and b) I gather some spiteful monks search for past nodes created by an author they personally dislike just to downvote them.

However, I don't feel that late UPvotes should necessarily be discounted--nodes with a lasting positive impact are part of what make this site great. We're encouraged to use the super search. If a great node comes up as a result of a search that really addresses an issue well (for example a particularly well explained Q&A entry), I don't think the resulting upvote should be "discounted" simply because it came a certain number of weeks after the node was created.