PC World has announced the launch of its new Advent Eco PC, a desktop computer which uses just 25 watts of power, yet hasn't skimped on specs. It has a T5250 Intel Core 2 Duo processor, 2GB of RAM, 160GB hard drive, DVD writer, four USBs and a DVI output, wireless keyboard, and built-in Wi-Fi (hence the big antenna sticking out of the back)...