I was just searching with Yahoo! and I saw a survey request from "Yahoo! Surveys". It was a big purple box to the immediate right of the results list, and it was anchored to the bottom of the screen (so even if I scrolled down, it went down too). I clicked on it before I realized I should have taken a screenshot, but I did take a screenshot of the single question in the survey. The question opens in a new window:

Click for full size, and no, I'm not going to tell you what my answer was :p