A interesting project that you can connect a Arduino with a Ethernet shield to for sharing sensor data :

Pachube (pronounced "patch bay") is a web service available at http://www.pachube.com that enables people to tag and share real time sensor data from objects, devices and spaces around the world.

The key aim is to facilitate interaction between remote environments, both physical and virtual. Apart from enabling direct connections between any two environments, it can also be used to facilitate many-to-many connections: just like a physical "patch bay" (or telephone switchboard) Pachube enables any participating project to "plug-in" to any other participating project in real time so that, for example, buildings, interactive installations or blogs can "talk" and "respond" to each other.

[From Pachube - community | connecting environments, patching the planet]

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