Here at Sharpdot we sometimes work with another web shop in New York called Blenderbox. One of the designers at Blenderbox named Jacks passed on this article about how Lucida Grande has steadily been becoming a standard font for the web-scape. I noticed over about a year ago, that it was being used on Apple’s website,  and have been using it in a recent project. Anyhow here is a link to the article from the “Ezzy Enough” blog.

http://qelix.com/blog/tag/lucida-grande/