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

Always keep things consistent. OpenID is still in infancy and non-existent to most casual users. It will confuse users who are not familiar with it and they may even end up thinking that they're opting to 'Open' their IDs to the general public.

You can optionally embed a unobtrusive link on the sign up saying "Have an Open ID?". This way you, those familiar with it know to use it, those who aren't simply ignore it.