Flx:
Would it be possible to make the 2 buttons show the status of the LED? (for example, if the LED is ON, the ON button should be dimmed)
Yes, next stage is to use a database to store details of arduinos and pins.
Once that is done I'll be adding the ability to get the status of the pins during the request so it can be shown.
The ultimate idea is to create a web interface for controlling an unlimited number of Arduinos over ethernet so a little bit to go.