1. know what you mean about sample set. its hard to get exactly the right person but close enough is good for me. 2. for the public places, i have seen a few people on sports sites and go up to them. (we built a new sports site)
i've seen ethnio.com, good call. in terms of being an evangelist, im not at all. the real issue is that most startups NEVER do this, i wanted to document what i've done and if people want to use/benefit then good. if not, sucks for them.