Actually, I AM really interested in this now after reading the original question.
Have any of you guys on here tried
WP multi-install and tried to cross-populate the user/profile data? It must be real easy, surely? Someone must have done it. In fact AppThemes have probably done it in one way or another with their forum/blog/ideas sections on the site. That must all, or most of it anyway, read from one DB?
I know that we're still waiting on Vantage, but do none of the other forum members think that it would be kinda cool to work out how to run Vantage as the front-end business site, then include jobs, classifieds, and whatever else, as add-ons to it? That's got to the ultimate local business site, isn't it? :-)
-Paul