Linksys helps with initial setup and makes sure you're aware of security issues.
LELA offers a network mapping feature that shows all connected wired and wireless devices.
You can find out plenty of information about connected systems but not all will be as forthcoming as this one.
The WRT110 offers a useful range of security policies for restricting Internet access.
QoS is on the cards and can be applied to a wide range of criteria including Ethernet ports.