Finally, I could finalize the project with a nice proof of concept (thanks to my wife who found a good box). This is what it is in a formula: Arduino + Ethernet Shield + LCD Display = Twitter LCD Reader! Practically speaking, you can use this object to read a public Twitter feed and display the last message on the LCD. It's plug-and-play, you just need to connect it to your home router (and select the RSS feed related to a Twitter account). Clearly, there's a lot more you can do, like making it completely wireless (with WiFi Shield and batteries, but the price will go up quite a lot), or read whatever RSS feed you like (with minor software modifications)...
Here is the final result, I'm going to prepare a full instructable and publish on the web soon...
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