If you are familiar with ASP, a simple method will be to create an application variable, initially set to 0. Each time the index page is loaded simply increment the application variable.
You should then have a seperate page somewhere that displays the hit counter by simply displaying the application variable.
For more advanced, and far more useful statistics you could use software such as WebTrends or have a look here for something we put together:
https://vault1.secured-url.com/iwanthits/Midas/hit.htm
This is example data we provide to our
SEO clients. Note that all the menus have been deliberately disbaled to prevent any baddies hacking my backend!
C.