Network-enabled Circuits

This is an old release, but I just came across this a few days ago.  How cool is this?

http://www.engadget.com/2010/09/25/netduino-plus-earns-you-ethernet-and-microsd-an-approving-nod-f/

Essentially it's the ubiquitous Arduino platform, but instead of this running custom C++ or Basic, this little guy runs .Net.  .Net cannot live on an island, so the fact that they are shipping one with a built-in ethernet port is really, really cool.  Network-enabled devices get cheap for hobbyists.

Any ideas for uses?  I have a couple and plan to work on them this fall and post what I build.