(I no longer use the Sharp Zaurus and do not maintain these pages. I have left them here in case they are useful to someone.)
If you want Apache and PHP installed, you can get it from here:
http://killefiz.de/zaurus/showdetail.php?app=113
Install it to RAM - doesn't seem to work on an SD card.
Then create a script to start and stop apache, like this. Copy it to /etc/rc.d/init.d/apache, change the permissions to allow it to execute, and execute it as root.
You can get MySQL from here:
http://www.caulfei.demon.co.uk/zaurus/index.html
I changed the user to Zaurus in /etc/my.cnf - which meant that I also needed to change the owner of /var/lib/mysql to the same user.
You can get PHPMyAdmin from here.