A big thank you to everyone who contributed to the OS poll last week. It's really helpful to know who's reading this site, so that I can work on describing the software that has the most potential to be used by the most people. As you can see on the results (which are still posted as of today), 2/3 of the respondants use Windows, and 1/3 each use Mac or Linux. I am also impressed to see two Unix users on the list also (you outgeek me!).
The good news about open source (and free) software: usually, it's available in Windows, Mac, or Linux versions. The mixed news: sometimes it works better on one OS than another.