Experience with Drupal SSO modules in Madison area?

Hey folks, I'm working at a small firm in Madison and we're trying to get a SSO solution up-and-running to deal with some legacy (non-Drupal) userbase synchronization issues. If there's anyone out there with experience in any of the various SSO solutions that exist for Drupal (that would allow for SSO with a non-Drupal system, i.e., not Bakery) who would be willing to come in and give us a hand in starting something up, we'd love to hear from you.

Thanks!