From www.to22.net via NOTCOT:
"To make a martini you will need a glass, gin, some dry vermouth, and, of course, an olive. While designing their unique martini glass, to22 decided to give greater importance to the olive. “The olive has become the signature element of a martini and, yet, it is treated almost as an afterthought.” The form simply developed from two conical elements with a hole in the middle. “ At first, we want to present an elegant, symmetrical object which has no bottom or top. It only becomes a glass when you plug the hole with an olive. Now, all of the sudden, this little green item becomes very important. After all, it is the olive that permits you to fill your glass.”
Also think it was shown on Tastespotting as well. This site is full of the most amazing links to cool stuff in the booze and food industries.