One underappreciated advantage of DuckDuckGo is that it doesn't censor results as Google does, which is really useful for finding, e.g., torrent sites.
http://www.technologyreview.com/view/419965/the-search-engin...
The content he’s blocking includes everything from “Made-for-Adsense” sites that offer no content at all to sites that offer only, in Weinberg’s judgment, low-quality content designed specifically to rank highly in Google’s search index.
“Usually the stuff I’m blocking is pretty straightforward, i.e. not really on the line. The few that have been somewhat on the line are usually big sites, and I’ve asked users or they have been driven by user reports followed by my subsequent investigation,” says Weinberg.
I have to say, I was really taken aback when I found that, and it made me wonder if I was doing the right thing promoting yet another censorship engine. Needless to say, I haven't changed anyone's homepage/search to DDG since discovering that as it took a bit of the wind out of my sails.