I've been wondering about this, too. If the primary domain is "smithjones.com" but the client, quite correctly, wants to use "smith-jones.com", "smithandjones.com", "smithjonescorp.com", and other possible variations, perhaps the solution is two IPs. One would be used for the primary domain, and the other would be used for all the variations. The second one would include just a home page with a noindex tag. The page content could either be a redirect to the primary domain or a duplicate of the primary home page with all links pointing to the primary site. It seems like the SEs would be happy, plus any user-bookmarked pages would be on the primary site. Any flaws in this logic?