The Leaders link (if you haven't seen it) shows the top voted users. Early on this was probably pretty useful. Now though the top user has 33101 points. This is 7931 points above the next user, and a ton more above the users below the second rank.
At this point there will be very few people who will even come close to that number of points and if he stopped posting for the next year (He's 2.9 years old) he might still be on the top, along with the rest on the list.
This destroys the use of a list of "leaders" because if, for instance, I make 10,000 points this week (1,428 per day) from great ideas/links I won't even show up.
So my suggestion is to not make the list 4 columns:
Col1: Users by highest # of votes for that day
Col2: Users by Highest # of votes for that week
Col3: Users by Highest # of votes for that month
Col4: Users by Highest # of votes for that year
