VR Zone reports NVIDIA is working on a special version of its MCP7A chipset for the Intel Atom processor. This chipset will even support SLI by offering two PCI Express x8 links, but I don't think that's really useful for Atom systems. Hybrid SLI would be useful though.
The MCP7A chipset can support up to 4 DIMM slots with DDR2-533/667/800
memories. Other features include HD Audio, 6 SATA ports, 12 USB 2.0 ports,
one PCIe x1, one PCI slot, IEEE 1394, Gigabit LAN. Nvidia too has another
chipset MCP79 for Atom too on a Pico-ITX board for Nettop supporting
single channel DDR3 SO-DIMM, HDMI, DVI-I, LAN, USB, SATA etc.