Cookies cannot access another domains cookie, so tracking across multiple sites should not be possible. There was a problem with this once, but that problem was plugged quite a while back.
If you want to see your cookie right now, type this into your browser address window
javascript:alert(document.cookie);
Some personal information such as your browser type, IP address, etc can be gotten to without the use of a cookie. You can stop this information from being given away by going to
Anonymizer ; this site works like a proxy server, which also filters cookies. Another site that does the same thing is
The-Cloak. I am sure there are some others out there.