I thought the Summer Olympics started Aug. 11, but I visited the official Athens 2004 Olympics site, and it says there are two days until it begins. On the home page, it proceeds to tell me the first soccer (or football outside the U.S.) matches are Aug. 11. How can the Games start before the Olympics start?
Nevertheless, the official site has a lot of options, including a schedule, news, results, biographies and about a billion other things that I left out. I was disappointed, though, at the coverage of synchronized diving.
Check your local TV listings to catch all the Olympic action. The Games last until the end of August, assuming that they actually end when the schedule says they will end.