Microsoft Windows Home Server
If you have a home network, you'll welcome the easy file sharing, remote access and the image-based backup features of Windows Home Server.
Iomega StorCenter Network Hard Drive
Iomega's fourth generation StorCenter Network Hard Drive brings many of the features found in higher-end storage devices down to an attractive price.
MikroTik's The Dude
This free tool delivers many of the same capabilities that you'd find in pricey network monitoring tools. As long as you don't mind tinkering, The Dude is a decent network utility that should be worth the download.