Debian-Administration has made a massive howto for LAMP on Sarge (Apache2, PHP5, MySQL5, phpMyAdmin, Smarty, ADODB).
It's all here
This documents my adventure setting up a LAMP server on Sarge with Apache2, PHP5, MySQL5, phpMyAdmin, Smarty, and ADODB. It covers installation and just enough sample code to test everything. It turned out to be pretty long. I should point out that I have deviated from the “Debian Way” by downloading phpMyAdmin, Smarty, and ADODB directly from their respective websites and installing them in /usr/local. I could find no backports for these, and kept running into dependecies on PHP4 which I did not want to install.