Hi Paul,
not sure the exact specs you're interested in, but here are some and you can let me know if it answers your question:
Mobo: Asus AT3IONT-I Deluxe (as some have commented already)
Proc: Dual core Intel Atom 330
FSB: 533MHz
Graphics: NVIDIA ION™ Graphics Processors
Memory: 4 GB, DDR3 1066/800
Storage: 128GB SSD (provision for 2 more SSDs - so 3 in total)
Drives: Slot-loading Sony bluray drive with the usual DVD-RW facilities etc
Connectivity: GB ethernet, wireless n, bluetooth
Ports: HDMI, VGA, USB
Audio Ports: RCA analogue, Coax/Optical digital
Other Features: Analogue in for the odd needle drop; a half decent headphone amp built in.
This level of spec means that, (with the 2 cores in particular), playing music while at the same time doing other stuff like creating playlists, ripping CD's, researching music on the internet, downloading hi-res files etc etc, can be done simultaneously without hiccup.
The significance of the level of graphics spec means that full HD video and blurays play with ease.
The power supply contains two separate dual rail supplies both with 300VA transformers.
The whole system is low power and passively cooled - so no physical or electrical noise and no moving parts (other when ripping CDs)
Software:
Windows 7 Pro - this allows remote control via a PC or Mac laptop using RDC
JRiver is the software player / organiser
dbpoweramp is the CD ripper
I don't bundle bluray playing software as most pefer to use their own or won't make use of it. FWIW I am happy with PowerDVD 11 Ultra, although I know Ben (docfoster) didn't like it and uses something else.
What else do you want to know?
Yes they provide a purely visual function

There are 4 blue LEDs at each cylinder that come on when the machine is switched on. When the machine goes into sleep or standby the lights flash to indicate the sleep state.
The cylinders act to 'project' the light and create a nice effect.
Not everyone likes the lights, and that's fine. It's very easy to lift of the screwless lid and disconnect the LEDs.
Although as Theo pointed out they also act as a deterrent to thieves especially when they flash
