SSO for all TKL web sites, eg Forums, Community Wiki and LaunchPad (Blueprints & Bugs - if possible)

I think it'd be great if users could do a single sign on for access to all TKL web resources. Currently forums and community wiki have SSO but a separate sign on is requirted for the Dev Wiki. Another separate sign on is required for LaunchPad (blueprints and bugs). Although perhaps SSO for TKL sites and LaunchPad my be difficult/impossible? At least the Dev wiki could be accessed with the standard TKL user account.