So I'm playing around with the MSN operators as per my post from last week and I stumble upon the holy grail of link searches:

(linkdomain:kennedyfunding.com linkdomain:hardmoneyfunding.com) (-linkdomain:avatarfinancial.com)

This search is showing only those pages that link to both kennedyfunding.com and hardmoneyfunding.com but do not link to avatarfinancial.com. You can actually use this to find co-citation linkers that currently exclude your domain and link to your competitors.

One more example - this one on SEO. These are sites that link to Matt Cutts, Aaron Wall and the SEOConsultants directory but don't link to SEOmoz:

(linkdomain:mattcutts.com linkdomain:seobook.com linkdomain:seoconsultants.com) (-linkdomain:seomoz.org)

You can build some damn cool tools with these operators. Let's all pray that MSN doesn't shut them down.

UPDATE: Yahoo! appears to provide accurate data on these searches too. More research coming soon.