I would add Bessed to your list of search sites trying to add the human element to create better results.

One of the challenges of human-powered search is that opening up search results to be finagled by the masses opens the spam door even wider than the robot-based engines do.

We at Bessed are encouraging visitor participation via commenting on results and suggesting new sites in the comments section, but we just can’t see opening it up to the extent that everyone can get their sites added immediately with no screening process. It’s more work for us and a slower process, but I can’t see how the wiki type model is going to be useful due to the spam issue.