I had to mention this just due to the sheer irony of it. Microsoft has released a gadget that will countdown to the end of support for Windows XP, however since it's a gadget it will only run on Vista or Windows 7.
I thought that was pretty funny.
Obviously this is most likely intended for system administrators on corporate networks that are still in the process of migrating off of Windows XP, it's still funny that the only way to get a countdown timer for XP support is to not be on XP.
So, for all you XP users out there, there's only a few years left! Time to upgrade!