It seems that Microsoft has no intention of being caught with an entrenched user base of Windows 2000 users who refuse to upgrade in 2010, when the operating system is officially considered obsolete by them.
I recollect that Microsoft had problems weaning organisations off of Windows NT when they considered that to be obsolete. It’s also worth remembering that Microsoft's revenue is largely dependent on persuading people to buy their latest software.
I note with interest that the latest version of the .NET Framework won't run on Windows 2000 Professional, that Internet Explorer 7.0 won't be available for Windows 2000 and that Defender (their anti-spyware product) won't be available for the platform either.
It seems increasingly prudent for organisations to consider upgrading to Windows XP (if they haven't done so already) over the next couple of years to avoid issues in the nearing future...