Build 1.0.701 is now available for download. Some details:
The latest beta refresh, build 1.0.701, extends the Windows AntiSpyware beta expiration date to July 31, 2006 and provides new signature updates to help protect against recently identified spyware.
Existing users of the beta (Build 1.0.615) will receive a software update that includes the new beta refresh. The latest beta refresh is also available for download through this site.
Microsoft would like to encourage all Windows AntiSpyware (beta) users to download and install the new update (Build 1.0.701).