Using Apache with authentication would allow for the monitoring of your kids/partner. With built-in GPS to capture the users location, a scripting language could display this location on the resulting web page. This could also be used to monitor employees, and hackers could possibly monitor their victims. A link to your favourite web mapping software like Google Earth could easily show you where the user is in the world.
A simple script in the office or at home could periodically request this page and you would never again loose your phone.

Another use could be to look at your mobile's phone book when you have left the phone in the car or at work.

I do wonder if these web servers that respond with something like "Apache - running on Nokia 6630..." will attract a lot of DOS attacks - not to slow the mobile but to push your GPRS traffic up until your credit limit is reached, and the mobile will stop making calls!