I have to say, I don't remember anyone talking about π day last year (or any year before that for that matter), but this year it's been all the buzz, thanks in part (I'm guessing) to piday.org. Some folks at my office even ordered a pizza π at 1:59 pm, which is "π minute" according to the π day wikipedia article.
Coincidentally enough, I watched the movie π for the first time ever just this past weekend. And my über-secretive pun-making co-worker has an o(π)nion on the matter too.
[...] Somehow with all the π day excitement I managed to miss this important announcement: Google has promised to strip your IP address and cookie information from search logs after 18-24 months (unless you're using their terrifying search history feature), making the increasingly ominous database of intentions grow pretty darn anonymous (and less frightening) as it ages. [...]