I've been working on a project I'm calling HomeNet that tries to simplify the setup and operation of a JeeNode based sensor network.
I discovered JeeLabs while I was working on my Master's Thesis last semester and I started building a fairly large sensor network. I got tired of manually programing each node so I created a modular framework that streamlines the process. It's by no means complete yet but it supports the exchange of information though multiple devices and methods - serial, wirless, and internet. It also creates a modular driver system for plugs that automatically setups them up and allows you to send commands to them from other nodes, from the PC Processing App and one day, from the Internet.
The code and examples are up at http://homenet.googlecode.com .
By the end of this spring semester, it should be a pretty complete solution to get data from a JeeNode or other Arduino to the web and graphed as well as sending commands from the internet to control individual nodes.
It's still very much a work in progress but I would like your thoughts and feedback on it and hopefully it will be a great use to you!