So far the selection of small form factor PCs was pretty limited, with most of niche manufacturers relying on AOpen miniPC barebone systems.
The new Fujitsu-Siemens Esprimo Q series just changed that.

Coming in similar shaped box, Fujitsu Esprimo Q5000 and Esprimo Q5010 miniPCs feature:
- Intel Core Duo 1.66GHz 1.86 GHz or
- Celeron M 1.46-1.86 GHz CPU
- Up to 2 GB DDR2 533/667 MHz RAM, 1 DIMM Slot
- Optional Wi-Fi and Bluetooth
- Gigabit Ethernet
- RealTek ALC880 Audio
- 40-120GB SATA HDD
- DVD +/- RW DL Multiformat DVD Writer/CD RW Combo
- Intel GMA950 Graphics
- Dimensions: 50×165x165 mm
- Weight: 1.79 kg
As you can see Fujitsu Siemens Esprimo Q5000/5010 is good looking, really compact and light weight miniPC that can give even Apple iMac a run.
Source: Fujitsu-Siemens