I downloaded and installed PHP and Lighttpd from Cydia and PHP ran flawlessly out-of-the-boc !
I uploaded a couple of my websites to my iPad in the Goodreader app ffolder (so accessing it easily) and symlinking that folder from /var/www.
My sites showed up normally .
But there was also an app called Activator installed (visible from 'Settings'. No idea what that is.
Any other experiences ?