It's a usability nightmare. No one knows what OpenID is, I only heard of Facebook Connect from you mentioning it. I once tried to establish an OpenID account f

It's a usability nightmare. No one knows what OpenID is, I only heard of Facebook Connect from you mentioning it. I once tried to establish an OpenID account for stackoverflow, but it was too much of a hassle so I didn't bother registering. Users can just reuse names and passwords. It sucks from a security perspective, but unless you can make it transparent to the user, you're pretty much boned because no one will want to use it.