Well, at the same time Google opened up Blogger to be used as an OpenID system as well. Well, here is a step by step approach on how your Blogger account may serve as an OpenID account in other websites.
Well, you may ask what this OpenID fuss is all about. The answer to this question is limited to enumerating the advantages of OpenID, the principal one being , from the address of your blog you may enter all sites to use this form of identifiable service. Many blogs and services (primarily on web 2.0) use this service as you save time and need not have to re-login.
Below are the steps to set up a blogging account to be used for OpenID purposes:
1. Access the configuration on your profile from Blogger Page (Important: You need to be logged into any google service/blogger to access the link).
2. Fill the data form and ensure that you select to activate the option "Enable OpenID for blogs"
3. Save changes.
Now on any webpage that accepts OpenID you can just place the URL of your blog to display your data or nickname and also your avatar image.
Hope this info helped you. You can read more about OpenID here.