most of today's download trackers are quite powerful solutions... they mostly offer much more than just displaying the download count.
You can start your search here:
http://cgi.resourceindex.com/Program...e_Downloading/
Personally, I use Schlabo's Download script. It comes with download counters as well as a nice hotlink-prevention which makes it much harder for other webmaster to directly link to your downloads, thus saving you lots of bandwidth.
edit: link is
www.schlabo.com/info/dl/2.01/index.shtml