[wp-hackers] WP Universal Login

[D. Stall]

Is there a way to make one login for 2 different WP installs hosted  
on 2 separate domains?

I want to use a WPmu domain for my "blog", while using my own regular  
WP domain install for my site with a nav link to "blog" at other WPmu  
site.

If user login is on my WP site, is there a way to make WPmu install  
on other domain recognize login so users don't have to login again?