For HTPC folks, XBMC recommends an upgrade from Windows XP to Linux
It's doubtful there are many people out there at this point that don't already know that support for Windows XP will come to an end tomorrow, April 8th. Despite that, a number of individuals and businesses will continue to run the operating system.
This doesn't likely apply to those maintaining an HTPC, as this tends to be a more geek-savvy set, but no doubt a few are out there. For those users, XBMC has passed its judgment, and the verdict is Linux.