publication date: Thursday, July 28, 2005 (part of Round XXVI)
clue: Back when the Internet was the newest thing, he proved it could communicate all kinds of information, such as, well, lists.
explanation: Newmark invented craigslist ("lists"), a free public website allowing people to exchange items for sale, rooms for rent, and other personal advertising. The word "newest" is a play on his last name. more…