I got the idea for this post when I looked at this: http://news.ycombinator.com/item?id=1036360 http://news.ycombinator.com/item?id=1036360 :-) A further comme

I got the idea for this post when I looked at this: http://news.ycombinator.com/item?id=1036360 http://news.ycombinator.com/item?id=1036360 :-) A further comment: Suppose you implement this and lots of people are visiting your page, then you may have a problem determining which visitor corresponds to which email address, since each query to Google docs will return multiple addresses. One way to get around that would be to create 10 documents; for each visitor, embed a random subset of the documents. This way you can uniquely identify visitors as long as you have fewer than 1024 visitors within a minute or two.