What posts are you particularly proud of?

On my blog, back before the release of The DaVinci Code movie, Google was doing a contest involving a number of puzzles.  Each day, a new puzzle came out, and you tried to solve it.  I decided to post the answers on my blog, and was amazed at all the traffic I got from it. I was getting tens of thousands of hits a day as people came by to check it out.  I remember being very proud of those articles and solutions.  (I even won one of the minor prizes.)  How about you? Are there some posts on your blog that you're particularly proud of, or that seem to bring a lot of traffic to your site?  What are they? What makes you proud of them?