this link. Here are some follow-up posts on the topic:
Matzah/Maror Chart for Rationalists - so that you, too, can have a chart!
The Popularity of Olives - discussing why this paper is so popular and yet hated by some.
Why On Earth Would One Eat A Kezayis? - discussing the strange notion that one should eat a kezayis of matzah on Seder night.
The Riddle of the Giant Kezayis Defense - wondering why many people would not accept that a kezayis is the size of an olive.
Maniacal Dishonesty About Olives - exposing an error-ridden critique that appeared in Dialogue.
It's Krazy Kezayis Time! - discussing the view that one should eat a huge amount of matzah in a very short time in order to fulfill all opinions.
Meanwhile, I am off to LA for three weeks. I probably won't have much time to post, but R. David Ohsie will be publishing a fantastic series of posts about Rabbeinu Avraham ben HaRambam's treatise on Chazal and science, and Rabbi Moshe Meiselman's claim that it must be a forgery. If you're in LA, please join me at the book launch for The Torah Encyclopedia of the Animal Kingdom, at Beth Jacob, Monday, March 30th, 8-10pm (and please spread the word!)