From the press release Microsoft Announces Pricing and Licensing Details for Windows OneCare Live we learn

Microsoft Corp. today announced final licensing and pricing information for its soon-to-be-released Windows OneCare™ Live, the all-in-one, automatic and self-updating PC care service aimed at helping consumers more easily protect and maintain their PCs to keep them running well. Now available free to new beta testers in the United States, at http://ideas.live.com, Microsoft® Windows OneCare Live will be available in June from retailers and via the Web for an annual subscription of $49.95 MSRP for up to three personal computers. To thank its valuable beta customers and offer an easy transition to the paid service, Microsoft also announced today a promotional deal offering the first year of Windows OneCare Live service for $19.95 to beta customers who become subscribers between April 1 and April 30, 2006.
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Designed to Fit Customer Needs

Microsoft research showed that most people’s computers are insufficiently protected from threats such as viruses because users find the protection process confusing and frustrating, and even if they once had protection services on their computers, they are often out of date. Many others have rarely, if ever, backed up the important data on their PCs or regularly run the performance maintenance tasks needed to keep their computers running well — which is risky in a digital age when consumers rely more and more on their PCs in their daily lives. As a part of Microsoft’s overarching efforts to deliver software and services that better protect customers, Windows OneCare Live provides a “just take care of it for me” service that keeps consumers’ needs at the center of the experience. When available as a paid subscription service in June, Windows OneCare Live will include the following features:

Protection Plus includes anti-virus and firewall protection and automatic updates, as well as anti-spyware functionality powered by Windows® Defender, to help protect the PC and the customer.

Performance Plus delivers regular PC tuneups to help maintain computer performance and reliability.

Backup and Restore delivers easy-to-use backup and restore functionality for the full PC.

Help and Support provides effective help when needed through a variety of modes — e-mail, phone and chat — with all service support coming from PC care experts at Microsoft for no additional charge.

Those who want to participate in the free beta test of Windows OneCare Live until April 30 should visit http://ideas.live.com.

I've been surprised to find out that Windows OneCare Live seems to be the one service that seems to resonate with end users the most when I talk to them about Windows Live. I can't tell if that is a good thing or a bad thing. :)