Just got mail from the OneCare team!
The Windows Live OneCare Beta (v1.5) Begins Today!
You are invited to the Windows Live OneCare Beta! Please follow the instructions below to install the Windows Live OneCare Beta (v1.5) today.
(Continue reading here)
Since we, the Beta guys, are allowed to forward links, here it is!
OneCare 1.5 is compatible with Windows Vista (RC1 and up) and is now localized into several languages and countries
OneCare is not upgradeable from version 1.1 or 1.0