It's interesting to see that the DevInfo project (UNICEF) now have
embarked on a PHP/Mysql based open source version:
http://www.devinfo.org/opendevinfo.html
To get an impression of the full (ASP.NET) version, have a look here
(don't click on Start, but rather on the colored buttons at the top):
http://www.aidsinfoonline.org/
Knut