Google has added OpenID support in Blogger comments engine – that means if you are logged into WordPress, TypePad, LiveJournal or any of the other OpenID supported services, you can leave a comment on Blogger Blogs using the same credentials.
This is a wonderful feature for Bloggers who have opened comments only to users that have a Google Account to reduce spam.
They can now accept comments from users of other blog platforms as well but will less probability of getting spammed.
OpenID support is currently available for Draft Blogger. Test this new service by leaving a comment here.