There was a lot of news today about the launch of ajaxWindows. This AJAX application is intended to completely recreate the Windows environment in a browser. Launched by serial entrepreneur Michael Robertson (mp3.com, linspire.com, ajax13.com), ajaxWindows is: ..."a complete virtual PC you can experience using only a browser from any web connected computer."
That is, assuming it is accessible. Looks like they hit a few bumps in the road today ;)