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You can drag a contact from Address Book onto a note to create a link back to Address Book. You'll see their name displayed, and if you control- or right-click on the name you have the option of opening their entry in Address Book.

This link is live: if you change the name in address book, you'll see it change in OmniFocus.

There are lots of cool things we will be able to do with this in the future (such as indicating whether they're currently available for messaging, like we do in OmniPlan; or searching for all references to a contact; or displaying their phone number; etc.), but for now the basics of making the association are in place. (We really want to do more, but we also really want to ship 1.0!)