AMD Fusion and Liano have destroyed the Intel Atom; Intel blew their lead.
The Atom was a good stop gap using a shrunk P4, but Intel hasn't built on it's lead, especially for SoC, memory support, bus speed and better featured chipsets; so the Atom is obsolete now.
I have an Atom netbook and used it heavily, so know how limited it is, especially for video. Even current Atom chipsets are pathetically slow due to the crippled bus speed, memory support, and poor or no support for HDMI, SATA and USB3. Yes USB3 matters now, because USB3 Flash is cheap and very fast!
I won't consider an Atom based computer for anything now, I will expect at least an AMD Fusion or Liano for any system I buy in future; I definitely can't take the idea of Atom NAS seriously.
This is why I built a low power, fast FreeNAS 8.0 RAIDZ2 box with an AMD Fusion Micro ATX mobo, an XFX 450W PSU, 8GB RAM, 5 x 2TB WD Green and an 8GB USB3 Flash stick, rather than any of the Atom mobos, because even high-end Atom mobos are crippled and more expensive! I did look at Intel i3, but decided was too expensive and power hungry for a NAS.