An interesting post by Simon Willison on the possible applications of OpenID. Its well worth a read. If you don’t know what OpenID is try this primer. From the post:

OpenID lets you create accounts for people without e-mailing them a password, or even talking to them before you sign them up. There are lots of useful things you can do with this ability:

Let your trusted friends delete spam comments from your blog, or fix your typos.