Zotac offers two versions of the Zbox nano AQ01. The regular model is a barebones offering with a quad-core A4-5000 APU clocked at 1.5GHz, Radeon HD 8330 integrated graphics, room for one 204-pin DDR3 SO-DIMM, and a 2.5" drive bay for your storage device of choice. Connectivity includes 802.11n Wi-Fi, Bluetooth 4.0, HDMI and DisplayPort outs, Gigabit Ethernet, five USB 2.0 ports, two USB 3.0 ports, and a "combo mini-Optical S/PDIF / analog output." There's a multi-format card reader up front, too.
The Zbox nano AQ01 Plus is almost the same as the above, except it comes with 4GB of DDR3 RAM and a 500GB 5,400-RPM mechanical hard drive pre-installed. No need to open this baby up to get it up and running—although you might still want to replace that hard drive with something a little speedier. Oh, and neither the AQ01 nor the AQ01 Plus comes with a copy of Windows. You'll have to bring your own.
One last thing: Zotac ships this baby with a VESA mounting bracket, so you can stick it behind your monitor and avoid cluttering up your desk. I kind of dig the concept in theory. In practice, though, having the system behind a display might make access to the USB ports a little awkward.