http://code.google.com/p/rolling-curl/
A more efficient implementation of curl_multi()

https://github.com/krakjoe/pthreads
http://docs.php.net/manual/en/book.pthreads.php
Posix threads in PHP. Whoa!

http://www.underhanded.org/blog/2010/05/05
Installing Apache Worker over prefork.

http://www.wikivs.com/wiki/Apache_vs_nginx
I stumbled on this page when researching the pros/cons of Apache + mod_php vs nginx + php5-fpm

http://barry.wordpress.com/2008/04/28/load-balancer-update/
Nice posting about wordpress.com's use of nginx for load balancing.

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