Very cool! Though it seems more like a hand-picked directory than a search engine with a crawler, as it doesn't find quite a few good noncommercial pages that I know exist.
I think humans are better at building such a thing if the aim is not gobbling up the entire web but only light websites that aren't commercial. I think that would be hard or impossible to automate. It definitely has an early 90's vibe in terms of results. Not terribly useful be but interesting nonetheless.