WordPress Performance: Why My Site Is So Much Faster Than Yours by Elliott C. Back
Pretty good run-down on performance improvements to be made to WordPress sites/servers.
#accelerator
Varnish
Varnish is a state-of-the-art, high-performance HTTP accelerator.
Squid User’s Guide
Wiki-based guide to using and managing Squid (the proxy/caching system).
Turck MMCache for PHP – Turck Software St. Petersburg
Turck MMCache for PHP – Turck Software St. Petersburg
Turck MMCache is a free open source PHP accelerator, optimizer, encoder and dynamic content cache for PHP. It increases performance of PHP scripts by caching them in compiled state, so that the overhead of compiling is almost completely eliminated. Also i