Who needs a fancy all-in-one system when you can just bolt a tiny nettop to your monitor? That might be what MSI had in mind when it designed the WindBox, a nettop with a small, flat enclosure and passive cooling.
The WindBox purportedly supports VESA wall-mount interfaces, and one of MSI's product shots shows the system stuck to the back of an LCD monitor. Extra power and display cabling might make that arrangement less elegant than a proper all-in-one PC, but the WindBox does look remarkably thin—a bit like a folded netbook. And hey, you wouldn't need to toss the display away if the PC broke.
Otherwise, the WindBox has pretty typical components for a nettop: an Intel Atom N270 processor, a 945GSE chipset, 1GB of RAM, 802.11g Wi-Fi, 100Mbps Ethernet, a card reader, and a lone VGA display output. MSI doesn't talk about built-in storage, although it says the system has a 300MB/s Serial ATA port. Additional perks include "longevity support for 5-year lifespan" and a "wide heatsink" that allows for fanless operation.