Hi again,
There are some statistics scripts that can let you keep track of all the files without placing the "tracker" on each page. You need to install it on your server, though.
There are couple of famous ones that you may be interested:
MRTG
http://people.ee.ethz.ch/~oetiker/webtools/mrtg/
Webalizer
http://www.mrunix.net/webalizer/
You can try stripping these programs' log toget the data.