Check out the new Microsoft Windows AnitSpyware (Beta) Home page. You'll find all sorts of inofmation about the beta there. Here's a link and some information from the overview page.
Microsoft Windows AnitSpyware (Beta) Home Microsoft Windows AntiSpyware (Beta) is a security technology that helps protect Windows users from spyware and other potentially unwanted software. Known spyware on your PC can be detected and removed. This helps reduce negative effects caused by spyware, including slow PC performance, annoying pop-up ads, unwanted changes to Internet settings, and unauthorized use of your private information. Continuous protection improves Internet browsing safety by guarding more than 50 ways spyware can enter your PC. The worldwide SpyNet™ community plays a key role in determining which suspicious programs are classified as spyware. Microsoft researchers quickly develop methods to counteract these threats, and updates are automatically downloaded to your PC so you stay up to date.