Microsoft made this announcement yesterday in their Security Newsletter for Home Users. Interesting the email headline they used, since the web site actually says Win XP SP1 support is supposed to stop on October 10th. Support for Win 98 and ME were set to end today. At any rate, if you're running Windows 98 or ME, it's well past time to pack it in:
End of support for Windows 98, Windows Me, and Windows XP Service Pack 1
Effective today, Microsoft no longer provides support for Windows 98, Windows Millennium Edition (Windows Me), and Windows XP Service Pack 1. Customers can access existing support documents through the Microsoft Support Product Solution Center, but telephone and e-mail support and security updates are not available.