I am going to be placing a banner on my website for a company and I want to be able to keep track how many users click through on the banner...how can i do this?
It depends on what tracking or analytics software you have. A crude but effective method would be to set up the outgoing link as a redirect, and then count how often that url is requested.
Hmmm...I'm pretty sure Analytics can do this, in the Site Overlay option, it tells you how many times each link/banner was clicked.