The D1 PC by Aleutia is a extremely small and energy efficient computer. The D1 compacts all the normal features of a PC into one tiny quiet case.
The Aleutia D1 is under half the size of most other SFF PCs (Small Form Factor Personal Computers) Aleutia claim, measuring only 26.8cm x 31.8cm x 7cm (10.55in x 12.52in x 2.75in) and weighing only 1.8Kg (though Aleutia do also claim it weighs 2.4Kg) compared to other SFF PCs which can weigh around 8Kg. The PC though is not lacking in ability, the D1 comes with an Intel dual core 1.66GHz processor, 4GB RAM, 40GB SATA-II HDD, DVD-RW drive and many other components that go into making this a suitable PC for office or light home use. The D1 comes with the Ubuntu Linux 9.10 OS as standard but has been tested to be fully compatible with the current Microsoft OSs from Windows XP to Windows 7.
By using energy efficient processors and combining them with laptop components like the DVD-RW drive, the D1 features a low power consumption, using only 26w (though Aleutia also claim it uses 34w, either way an exceptionally low power drain) which could mean the D1 uses only 25% of the energy of other SFF PCs. Because of the energy efficient processors, the D1 also produces less heat, meaning it requires only a small fan to cool the system. The smaller fan causes less sound than conventional desktops, and can only be heard whirring when your ears are very close to it.
Source: Aleutia D1 Product Page