ACorp
Reaching their stand revealed their own take on the Shuttle XPC's.

Whoa!
First thing that struck me as the build quality & the two 5.25" drive bays! (The extra drive bay doesn't really add much height). There's a nice row of meshed cooling vents in the front. The case cover is lacquered. Now here's the interesting bit: They're using their own motherboard, which is laid out & has the same mounting points as the Shuttle XPC boards...

Incidentally, these boards look like they are available to buy separately. Their AMD solution is called the Q7-2 & is based on the SiS 740+961 chipset. The Q4-2 for Intel CPU's is based on the INtel845G chipset. Currently, they both have two PCI slots and no AGP, but they said that they plan to move to one AGP and one PCI slot shortly. A 200W PSU with 80mm fan, one 10/100 NIC, six channel sound, six USB2 ports & 1394. (Although the 1394 seems to be absent from the Intel based box). Apparently, they are working on new boards with newer chipsets for these boxes.

Here's the stunning black version.
ACorp are not that known, but after speaking to them, it was obvious to me that these guys are serious about the quality of their 'cube' products & the features they provide in them!