It seems there are some things to get ironed out on this front. Intel has its own ideas about what the Atom should be used for, it seems.
The Atom makes a nice candidate for a green small server but it has yet to find a 'green' chipset or small server oriented mobo. By that I mean a mobo with dual gigabit ethernet, a decent set of expansion card slots and ports, and basic PATA and SATA support, I don't think RAID support is needed but that seems to be a no cost add-on when you have 4 or more SATA ports. Also in this unnecessary (in my view) feature creep for this application is home theater sound and high end (but slow) on board graphics which aren't needed in server roles. I could do without any graphic or audio support as that role should be by web interface or SSH in this application.
I notice that some devices are showing up at CES that combine a number of small server functions. It'd be nice if there was an inexpensive mobo with an Atom and about 2 GB memory to make it easy to build a broadband modem, firewall, gateway, router, switch, wifi terminus, NAS, home control and security, voip, fax, and similar function into a small 'green' box. Oh, BTW, it needs to be able to run off a gel cell and control some external power outlets, too. Cost under $500, of course.
oh well, for now it appears that an AMD chip on an Asus board is as close as I can get.