Yahoo's YSlow Plug-in Tells You Why Your Site is Slow
Stoyan writes "Steve Souders, performance architect at Yahoo, announced today the public release of YSlow — a Firefox extension that adds a new panel to Firebug and reports page's performance score in addition to other performance-related features. Here is a review plus helpful tips how to make the scoring system match your needs.
YSlow require Firebug to previously be installed in order to run. It is an extension of the capabilities of Firebug and so is an extension of an extension, a meta-extension if you will.
If you put the links to the CSS at the very top of the head section then that grade will jump from an F to an A.
I doubt moving them above title makes any noticeable difference in the real world though.