Arduino forum member 'goofball' has documented his work in progress which is the control of a Sharp LCD television via his home network. Using an Arduino Mega and custom RS232-interface circuitry, he can control the TV via a web interface. Following this is an Android app to control the TV instead, and the code is included for your perusal.
When your projects outgrow the normal Arduino-compatible boards, running out of program and flash memory space, or you're stacking on Ethernet and microSD shields, or all at once - it's time to upgrade to the Freetronics EtherMega:
Quite simple the EtherMega is the fully-loaded Arduino-compatible board on the market today. Apart from being completely Arduino Mega2560-compatible, it includes full Ethernet interface, a microSD card socket, full USB interface, optional Power-over-Ethernet support and still has a circuit prototyping area with extra I2C interface pins. So if your project is breaking the limits, upgrade to the EtherMega today.