<A HREF="http://www.cio.com/article/137850/New_Blue_Sky_PC_Is_Lenovo_s_Smallest_Most_Energy_Efficient_Desktop">Lenovo unveiled its smallest, most energy efficient desktop PC,</A> called the ThinkCentre A61e or "Blue Sky," which is about the size of an average U.S. phonebook, according to the company.

The A61e ultra small form factor desktop PC runs on 45-watt AMD Athlon 64X2 dual core and AMD Sempron single core processors, and starts at just $399 after mail-in rebate. Lenovo says users of its existing PCs can save as much as 50 percent in annual energy costs by making the switch to the A61e.