USA had the most medals.
ostralia
RankCountryGoldSilverBronzeTotal1Republic of Korea30142Italy10013People's Republic of China01123Japan01123Mexico01126United States of America0101London Olympics Medal Tally
http://en.wikipedia.org/wiki/2000_Summer_Olympics_medal_count
For latest medal tally and updates visit the following site in related links where the official result links are available.
Go on the BBC website sir!
The United States won the most medals (91) and the most gold medals (36) at the 2000 Games in Sydney.
Australia's final tally: 14 gold 15 silver 17 bronze 46 total
Australia topped the medal tally at the 2010 Commonwealth Games with 177 medals.
Australia topped the Gold Medal tally with an astonishing 74.
The medal tally of the Philippines in London Olympics 2012..... As of now....July 31 2012....9:20 pm... GOLD 0 SILVER 0 BRONZE 0
New Zealand has won 86 medals (36 gold, 15 silver, 35 bronze) at the Summer Olympics and 1 medal (silver) at the Winter Olympics.
USA is leading the all time summer Olympics medal tally with 2188 medals(This does not include medals won at 2008 summer Olympics)