Instructables user Claudio Vella has demonstrated how to create a nice web-based control of digital outputs using an Arduino Mega board and an Ethernet shield. If you have a fixed IP address or service this could be controlled from almost any web-based device. The code to generate the webpage is in the Arduino sketch, so the entire project can be self-contained.
Combined with a relay board such as our RELAY4: or RELAY8: you could control a huge variety of devices. The interface is neat, for example:
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