Rich has chops in this space. A very good read.
We know this from experience: No one will ever go to Mahalo directly, just as no one ever went to About.com, dmoz, Tripadvisor, Nextag, IMDB or any other vertical or broad-but-shallow site. Google is where everyone starts and Mahalo’s distribution strategy has to be SEO. Its traffic is going to live or die based on SEO skill and Google’s continued favor.