As you might have heard, Microsoft acquired the company Giant Software last month, for the purpose of creating their own spyware-removal tool based on Giant's AntiSpyware product. Microsoft was supposed to have released a beta version of the new Microsoft AntiSpyware today, but it seemed to be unavailable at the time of this writing. If you want to check out if it's back, try these links:
Thanks to InsideMicrosoft for the links.
Update: The links work now. Enjoy. :-)