I have started up a site for entrpreneurs to find business partners to complement their skills. It's called http://www.startuppartners.org/

So, for example if you are sales/marketing person, and need to partner up with a tech guru to get something started - then you can find that person here.

However, I really don't know the best way to get people talking on a forum, and get the critical mass required.

Any help woud be appreciated!