Fields Medals: Okounkov, Perelman, Tao, Werner. I was excited to see Terence Tao win because I’ve actually read and understood one of his papers. Not the stuff he’s winning the Medal for, of course. See Michael Nielsen (rising from his deep silence 😉 ) for connections of Tao’s work to quantum information science (by Hayden, Daftuar, and Klyachko.) Perelman has, apparently, declined the Medal and the arxiv is stressed by people downloading his papers:
22 Aug 2006: arXiv.org servers are currently under very heavy load due to demand for Grisha Perelman’s papers, published only as arXiv.org e-prints, which are available below. We encourage you to use a mirror such as lanl.arXiv.org or aps.arXiv.org, and we thank you for your patience as we try to accommodate the demand. Perleman was named a Fields Medalist at the opening ceremony of the International Mathematical Union.
Nevanlinna Medal: Jon Kleinberg.
Gauss Prize: Kiyoshi Ito. And the quants rejoice!