The following link includes a fact sheet about Windows Security Essentials, code named Morro, which will eventually replace Windows Live OneCare.
http://gizmodo.com/5295656/microsofts-free-morro-antivirus-software-available-on-june-23rdAdditional information here:
http://blogs.zdnet.com/microsoft/?p=3120The official web site is here:
http://www.microsoft.com/security_essentialsForums for MSE are here:
http://social.answers.microsoft.com/Forums/en-US/category/mseFrom the main page:
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How to get Microsoft Security Essentials BETA
To get the beta, just click here or on the button on the top of this page. This will take you to Microsoft Connect where you'll answer a few questions and then be able to download the Security Essentials beta.
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The download will be via Connect, so be sure to have an profile registered on http://connect.microsoft.com if you wish to participate.
Update 6/25/09 - The download for US/English has been suspended for now as the limit has been reached. It will be made available again in the near future, so check back at the above link for availability.
-steve
Microsoft MVP Windows Live / Windows Live OneCare & Live Mesh Forum Moderator