First of all, the numbers inside a large square, currently telling you your position on the leaderboard, are not aesthetically pleasing. If those could just be made into larger numbers, a font size that fits the whole line, vertically, that would be better.
Secondly, it could be a nice touch for those positions to have customizable titles as well. - You could have military titles for military themed Wikis, from General to Private or Scrub... - Scholarly titles for knowledge themed Wikis, from Professor Emeritus or Nobel Laureate to Kindergarden Pupil... etc.
Anything but those boring, mostly empty squares with a small number in it... :)