Images of Current Cost RJ45 pin-out http://flickr.com/photos/pixelfrenzy/2499443217/
Guardian article http://www.guardian.co.uk/help/insideguardian/2008/jun/23/hackinggoodnessontheweeken

The Current Cost unit I ordered earlier in the week arrived today.

Immediately it was out of the box to be set up. Suprised that it actually came with a 20 page user guide I decided to follow the instructions rather than ignoring them till something went wrong. For a change the instructions were clear and useful.

I've been meaning to do this for a few weeks, but I've just got round to ordering a Current Cost unit... Looking forward to having a play and then probably driving people nuts by knowing how many pence per year things cost to run!