For me, the greatest moments are,
1) Qualification for Sharjah finals which was done single handedly by Tendulkar against Aussies.
2) Sachin's b'day century in the same series.
3) Yuvi's amazing catch ( like Rhodes ) in Champions Trophy against SouthAfrica ( dont remember which yr, but that catch made the things to slow down for SA & got them to loose from winning position )
4) Sachin's amazing knock against Pakistan in WC03.
5) Venkatesh Prasad dismissing Aamir Sohail very next ball after showing some signs to Prasad in 1996 WC!
6) Astle's fastest 200 against England which made them(England) panic at the last moment though England won that match.
7) Dravid's 230+ in Australia.
8) A.Donald's silly run out in WC99 against Aussies which lead to an tie & Aussies qualified. The way Klusener batted was just amazing!