http://www.evo-dev.com/products/evotopsites/ is another one that seems to be popular, but I've never used it.
http://evo-dev.com/products/evotopsites/ far better than any I've tried (I've tried all of the above)
Both of these top lists scripts are .php, so they fit what you are looking for. You can get them free at: http://www.marketinginfohere.com I looked at them and they seem to be okay for top lists. Never loaded them up or anything, so I can not vouch for exactly how good they are.
anyone use a topsites script that didn't create a massive server load? Aardvark killed my host and I had to take it down do to the number of hits the button.php was getting.