Who said there was no such thing as a free lunch? In my experience I have found that the some of best Windows programs are in fact the ones that are completely free, (winscp, putty, firefox etc...) which is why I like this idea so much. The OpenCD is a collection of high quality free and open source software designed to run on Windows. If you don't feel brave enough to make the switch to Linux for your main system, then this is a good introduction to open source software that will run on your current Windows machine.