Make your website faster with Google tips
Besides the articles, It is possible to reach videos of speeches by several organizations on website performance.
Also, links to various tools for the issue provided & a large community discusses the subject continiously.
Now, Google is sharing an open source Apache module named mod_pagespeed that automatically optimizes web pages and make them faster to load.
You can read more here: http://code.google.com/speed/page-speed/docs/overview.html.