From Ars Technica:

A new wave of super-small NAS devices comes with more features than one person could ever possibly use. But until certain OS vendors step up with real, client-level support for home NAS, devicemakers will keep piling on features in an effort grow the market.
Good state of the NAS Box address ... How we got here and what is going on moving forward. Excellent read if your thinking about getting one or looking to replace/upgrade your current setup.