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Hello,
yeah, i purchased one a while back. it's a very nice device. power wise it needs >1amp @ 5v - so a normal usb mobile phone charger would work for example. it uses a mini-usb connector for this.
i did have some issues with the power input on mine: a normal iPhone charger (e.g.) didn't work - the machine would boot, but then the (single) network ethernet port wouldn't. it wasn't until i used an amazon kindle charger (rated at 1.8amp @ 5v) that it was completely useable. YMMV.
there are also 2 usb 2.0 ports on the device (with relevant power draw) which can be used to connect wifi cards etc. but i've read that keeping certain items powered will require a beefier power supply.
i run debian on the box; so all the standard apt-get's etc work great from it. dd'ing the image was easy; and i was able to install onto a 2GB SD card. although i guess a 4GB would be better (because a 2GB image is not always <2GB).
you can also run arch linux on it, although i'm not sure why you would bother.
the only downside to the device is that lack of cover/box for it. it comes as a circuit board only. it's just a little too big for an altoid's tin. it can also get a little hot (to the touch), so ventilation holes would be required. production volumes are still quite low at the moment (and they're coming out with a 512MB version as standard), so you might have to look through ebay for one (and pay more).