What do you do to find trustworthy feedback?

As I said in my previous question, I don’t trust solicited feedback. I believe people will pull their punches and say they like something even when they don’t.

I don’t know if anyone else has this problem, but I’d appreciate some feedback on how to get around this problem. How can you encourage feedback without biasing the feedback? If you can’t ask someone what they think, what do you do?