As par definition on their website – www.mahalo.com:
Mahalo is the world’s first human-powered search engine powered by an enthusiastic and energetic group of Guides. Guides spend their days searching, filtering out spam, and hand-crafting the best search results possible. If they haven’t yet built a search result, you can request that search result. You can also suggest links for any of our search results.
I heard its CEO speaking about their ideas on LifeOnline. I think they have a mountation to climb and they have just started but even with what they have done so far they have managed to make searching a pleasure on many popular search terms. Check them out.