Help Tracking Unique Visitors

I'am wondering if someone could help me out with this.

I am trying to do a better job tracking unique visitors and thought Apache's (v.1.3.27) CookieTracking was the answer. I can set the client cookie using the following in my .htaccess file.

CookieExpires "7 days"
CookieName "MyIPAddress"
CookieTracking on

However, the cookie does not show up in my web logs. I have looked at the CustomLog directive, but it does not works in .htaccess. Is there another way?

Thanks for the help in advance!