Low-power PC

[Digit]

It's Hyper-V with a mix of guest OS-es: Windows XP, Server 2003 and CentOS, Fedora, IPCop based appliances.
Why this option? Cause it suits me best; I have more experience with Windows than Linux, and I don't see a benefit when I change the way it is now.

[Bwired]

The process which consumes the most CPU time in there is the Plugwise Source...
Could probably save me some more Watts!

The protocol is available, so put it higher on your list