Intel was actually first to market a mini-ITX Atom based motherboard: the D945GCLF. Based on a single-core Atom 230 running at 1.6GHz, the D945GCLF is a relatively simple motherboard. Zotac is the first manufacturer to produce a mini-ITX motherboard based on NVIDIA’s Ion platform. Take Intel’s Atom processor, pair it up with NVIDIA’s Ion chipset (which is basically a GeForce 9300 chipset) and you have the Ion platform. The Zotac Ion is available as a mini-ITX motherboard alone. Mini-ITX will work in ATX, micro-ATX, and mini-ITX cases. There are two versions of Zotac’s Ion, the ION-ITX-A-U and the ION-ITX-B-E. The more expensive “A” model ships with a dual-core Atom 330 processor, a mini-PCIe WiFi card and an external DC power supply. The “B” model comes with a single-core Atom 230 processor, no WiFi and requires a standard power supply.
More info: AnandTech