This is an open suggestion to Bloggers who use Blogger – specifically those who are restrictive on allowing comments.
Once upon a time there were three options for who could comment (assuming that you allowed comments on the blog in the first place). The options were Anyone, Registered Users, and Members of the Blog. I can understand the drawbacks of allowing anyone to comment but not everyone uses blogger – that makes for less than ideal choices to be made.
Recently there has been a new option added. Registered users used to mean people with blogger accounts but that has become “Users with Google Accounts.” The new “Registered Users” option allows people to use WordPress, TypePad, AIM/AOL, or LiveJournal identities to make comments. This is nice because users like me are no longer forced to use a defunct identity to comment. Please consider using the new “Registered Users” option if you currently only allow Users with Google Accounts.