Based on a recent article from Information week, the OLPC will soon be having XP as a potential OS. Let's wait to see what the $3 license will do the price of the OLPC and what type of new software will be emerging for the OLPC. This is announced for June.... So keep your eyes out for it.
Source: http://www.informationweek.com/news/windows/operatingsystems/showArticle.jhtml?articleID=207800623 [3]
Links:
[1] http://linux.philosweb.com/drupal/category/it/hardwareolpc
[2] http://linux.philosweb.com/drupal/category/it/software/os
[3] http://www.informationweek.com/news/windows/operatingsystems/showArticle.jhtml?articleID=207800623