My family computer is the second Dell we have had with XP Home for the kids gaming entertainment and dual booting Linux mainly for my doing the books. Under XP we have used open source applications for the most part: Firefox, Thunderbird, OpenOffice.org. So off to a great start for migration.
Prior to allowing kids to play on the computer my wife had been using Linux with our first Dell. Then she just stuck with XP instead of having to keep rebooting for the kids. They had acquired many educational and gaming CD's over the years.