Furthermore, the Sugar user interface allows for greater control over what can be done with the system. The programs being created for it (with the possible exception of Doom) are designed to help children create, explore, wonder, strategize, and learn.
This is why I fear that some the unique educational potential of OLPC will be lost with the conversion to Windows. The platform, and, at least as important, development community, would no longer be so focused on programs that were created for learning and thereby lose the strongest advantage the OLPC had. For all its issues, Sugar is an amazing endeavor.