Voting starts in March for the Drupal Association Board election.
Here is a simple Tokens implementation, providing the SSO URL as a token for use by site builders.
In my case, I had a custom 403 node with a login link whose look & feel (and the text) needed to be content-manageable. This provides a token like this:
<a href="[janrain_capture:sso_url]">Get Started!</a>