Either support good old classic login/registration or give us a link to OpenID providers. I have NO idea what my OpenID url is, but I know I have one with Yahoo. Now I have to go look it up, so a link to it all would be nice. (Most sites offer you to click on the various OpenID vendors and it auto-fills in the "base" url for you)

Otherwise a nice site and I'm actually interested in trying your app, looks like a task management tool that might be done right