While I don't use OpenID myself, there are a number of users on my social network asking for its integration. It seems that many users are now beginning to *expect* Web 2.0 startups to provide support for it (just as they did for Firefox). I anticipate that, in the future, when big name startups like Digg and LiveJournal begin supporting OpenID, there will be a huge following by other sites as well. Put simply, crowds follow crowds.