How about a business opportunity? Modify an open source browser so that it lets someone navigate a website without being able to read anything on it or look at any pictures. Set up a Mechanical Turk style application that lets workers execute browsing sessions using the modified browser via VNC. The modified browser will save off all of the pages, which can then be parsed for information. The server will match up retrieved information with particular users. No worker will ever see any actual user data.