One of our future planned services is offering a traffic tracking tool. Currently, it’s a bit far back on the list of things upcoming, but we will eventually offer a product once we are sure it is of top quality.
In the meantime, there are many free services you can use to get the basics of your traffic. We’ve been testing statcounter for a couple of months and they have a nice product. The numbers aren’t real representative of what our server logs say, but offsite tracking seems to have the ability to lose some numbers. Each free service offers the basics then allow one to upgrade for more detailed info. There are also many paid services like Omniture, Websidestory & Webtrends. The best thing to do is have one of their staff give you access to a demo to ensure you get what you are looking for before paying.
Tracking traffic can tell you many things, including a better way to target visitors and convert them. If you do not currently track your visitors, we highly suggest you give it a shot and ask an analytics expert to show you how to read them if unclear.