@talmy: Did this really make an impact? I mean, modern computers don't use too much power anyways (except the big screens)?
It did for me, but the old Dell wasn't that modern! It was purchased in 2002, a 2.2GHz Pentium 4. Replaced with the Mac mini server in 2010. Look at it this way -- if you save 100 watts, that's 2.4 kWH/day or 72 kWH/month. If you are paying 10 cents/kWH then that's costing $7.20/month.