Read the "levels" tutorial at http://www.cambridgeincolour.com/tutorials/levels.htm (really a well-done site). Would love to be able to print some nice-quality large format prints to put up in my office.
Other sites of interest, found while trawling:
GanttPV - Open Source Project Management
A blog post: 30 Essential Open Source Packages for Windows
Another link to it: http://www.thesimpledollar.com/2006/12/01/30-essential-pieces-of-free-and-open-software-for-windows/
Digg.com. Off the hook on Digg: Stack and Swarm -- these innovative interfaces show what is happening on the site in real time.
For fun... FreeMind - free Mind-Mapping Software
True Combat: Elite. Not that I support violent games, but I cannot deny that my brother Derek and I spent many a night after work at StratosWare, hunched over Wolfenstein and Doom. I was surprised to find a free, open-source version on the net.
Detecting air leaks in your home. A couple easy suggestions for reducing or eliminating drafts and cold air in your house in the winter months. Makes it comfortable and saves energy.