These may actually be different:

Comparisons:

http://www.microsoft.com/athome/secu...mparisons.mspx

OneCare:

http://www.windowsonecare.com/
http://www.windowsonecare.com/prodinfo/default.aspx


Note: The comparisons page mentions Defender Beta 2, and does not mention anything regarding what'll happen once this is out of beta.