To OpenID or not to OpenID? Is it worth it?

Question

Does OpenID improve the user experience?

Edit

Not to detract from the other comments, but I got one really good reply below that outlined 3

Answer 1

What I like most about OpenID is that it doesn't feel like I'm creating an account at all. It's more like I already have an account for the entire Web, and StackOverflow is taking notice of it when I log in. I'm really tired of having to create a new "identity" on every site I run across because they want to have a bigger user count.

I also like that sites that (only) use OpenID tend to make the whole account experience more flexible: no email confirmation required, no enforced-unique usernames, use of Gravatar, etc. The upside is that there is no registration; I just log in like I was already here.