Started looking into a (sort of) new technology lately called openID. It allows you to use an existing account to login to a new site, instead of creating new accounts everywhere. Example: I’m at someone’s blog that only allows registered users to comment. I can enter my openID url, it asks me for my yahoo (or aol, or any other openID provider) credentials, and then I’m allowed in, without having to create a new account. It’s not widely adopted, but it’s pretty slick for the places that use it.