Without repeating those already mentioned...
Game 6 of the '08 Finals
Season opener of '07 against the Wizards... first game with the new big 3, and we won by 20 after Gilbert guaranteed a win. That was the first non-preseason hint that this big 3 may just have what it takes. Besides, I was at the game so it's got a special place in my memory banks.
Ray's first buzzer-beater against the... Bobcats, I think.
The team collectively stepping on Detroit's throat in the playoffs '08 after Pierce was called for that offensive foul.