www vs no-www and cookies
Very good article of using cookies with domains including www and without it. Why it is important to use or not to use cookies, and some grate tips you would find in this post.
One of Yahoo’s performance rules says: Use cookie-free domains for static components. This is good because the server has no use for cookie information when serving a JPEG or another static component, so all this cookie information creates network traffic for no reason.
Like usually good article with some examples and code snippets.