I was just about getting the energy saving bug, though it really took towards the end of the year to bite, someone having challenged me to think of optimising my home/office energy use as an engineering challenge.
See a screenshot for the site as of May 2007 below (and click through to the Wayback Machine snapshot).
Now, something like 10 years after that 1-pager idea, Earth Notes is well over 100 pages, has been cited in research papers and newspapers, has been used as a data source by government departments and electric car/storage bods (in both cases for PV generation data), has its own Twitter feed (@EarthOrgUK) with about 54,000 tweets so far, and is still going strong as of June 2017!
See a screenshot from June 2017 below (and click through to the archive.is snapshot).
The thinking behind the site eventually had me lead a smart heating workshop at the UK's Department of Energy and Climate Change in late 2012, and start the Open-Source Thermostatic Radiator Valve (OpenTRV) project in 2013 with the aim of knocking several percent off Europe's carbon footprint (and several £billion annually off home heating bills).
Here's to another decade!