If you think that any of those many great press bureau pictures that you saw from the Olympics in Beijing were just lucky punches, think again. This little video from Reuters shows with all possible clarity that it's hard work and tonnes of resources that gets the photographers 80% of the way towards the great pictures - the last 20% is skill and some luck.
Reuters brought 40 photographers and 25 people to edit, process, transfer etc. to the games, and the video illustrates some of the efforts and preparations made to grab the right shot of the right person in the right moment. Impressing!