There was a good point that Simon Willison raised recently. If your building a web app and that app gets dugg, the digg users will be able to log straight into

There was a good point that Simon Willison raised recently. If your building a web app and that app gets dugg, the digg users will be able to log straight into your site with no sign up process if you support openID. Aything that lowers the barriers to someone using your app has got to be a good thing.