Use an Information Card to Log Into Windows Live
Did you know you can sign into Windows Live without entering your password? That’s right; you can use an Information Card (a digital certificate) to sign into Windows Live. Do note that the service is still in beta (testing mode) and it has been for a while. But if passwords are annoying to you (as they are to me), then you can use the alternate way to login.
Read Microsoft developers’ blog about it at http://winliveid.spaces.live.com/Blog/cns!AEE1BB0D86E23AAC!931.entry , then when you have your Info Card and are ready to log into Windows Live, click on the link below: