A very long tutorial on making an advanced user system with usergroups, timezones, avatars and "online now" system.
A short explanation and a couple snippets of code on using zlib or output buffers to GZip your content (text/html, text/xml, text/plain, or whatever).
A tutorial on how to compile, install, and configure mod_gzip for apache to gzip your javascript and css files saving loads of bandwidth.
A nice tutorial on how to compile, install, configure, and use eAccelerator for PHP.
A nice tutorial on how to create advanced pagination for your website.
A tutorial on expanding the background (image and/or color), and/or border (left or right) of an element to 100% of the parent element (good for columns that are not always as tall as the column next to it)
A short tutorial on adding multiple onload functions to a webpage using addEventHandler/attachEvent.
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