Hi,
I'm starting to look into a single sign-on solution and the 2 top solutions appear to be Cosign (http://www.umich.edu/~umweb/software/cosign/) and OpenSSO (https://opensso.dev.java.net/public/use/index.html).

A Single Sign-On jumpbox would be really cool to have. I have also seen for Cosign that Drupal has a single sign-on module built (http://drupal.org/project/cosign).

Perhaps SSO modules could be included in all of the Jumpboxes.

Thoughts?
-Brian