In 2011, I added an anonymous feedback form to
gwern.net
. It has worked well (116 entries) and justified the time it took to set up because it encourages people to correct various problems or tip me off on things. If you have a site, maybe you should add one too.
For the full writeup, see http://www.gwern.net/About#anonymous-feedback
Interesting. I've held off with creating an anonymous feedback form of my own, given that I occasionally have a somewhat thin skin and some self-esteem issues, but that was with the expectation that the feedback would be predominantly negative (since people are usually much more likely to voice criticisms than praise). I would not have anticipated as much positive and as little negative feedback.