Yes, I do - it's OpenGLES2 using the imx drivers. I think it's PowerVR device. glmark2-es2 works (though I think there is an artifact with the z-buffer).
They have forums at power-developer.org - very nice bunch of folks.
It's sell Ubuntu 10.10, until they get their drivers up to 11.04, but on the site there are many other different distress, and even people experimenting with armhf (hard floating point).
The draw (pun intended) of the DreamPlug is the appliance-like form factor combined with very low power consumption. Also keep in mind that the plug computers are kind of a marketing tool to get companies to buy their custom-built ARM devices from GlobalScale. If the PogoPlug and similar plugs are any indication, at high enough volumes, it should be possible to make a profit selling a finished device for the price of a D2plug.
btw, did you get video acceleration on yours?