It has a USB/serial console access for emergencies I guess but most of the time I'd access it as I do my current server, via SSH in one or more xterm sessions from my Mac or other laptop.  No need for graphics support at all.

The plug has a slot for a SDHC memory card, ie up to 32GB.

I need something like 100GB+ storage, which I could do with a slowish external power-efficient hard disc or solid-state mass storage, which would have to be have a very power-efficient sleep mode.  I would expect to cache frequently-accessed on the SDHC.

Unless I put in a USB hub (or put in some clever Ethernet based stuff for example) then I can't get at my current digital inputs of off-grid solar system battery state-of-charge and nor could I run my X-10 automation stuff.  The former would be more of a shame than the latter.

In the end I may end up with something more like this which exposes more direct I/O:

http://www.marvell.com/products/embedded_processors/developer/kirkwood/openrd.jsp

In any case there is real hope that it could be run 24x7 throughout the year from my 120Wp 12V.40Ah off-grid system that powers my office lighting.

The ADSL modem would remain on-grid for the time being.

Rgds