Login Federation

[Brett Carter]

I've dug around a bit, and haven't found anything, so I thought I'd  
ask here.  Is any work being done on adding some sort of federated  
login for open id?  By 'federated' I simply mean that signing into my  
open id provider, this automatically signs me into all my open id  
enabled sites (of my choice) at once.

I have a few ideas I'd like to kick around if somebody isn't already  
working on this.  If so, please feel free to point me in the right  
direction.
-Brett