There have been sooo many, but these are the ones that stand out:
Queens, the first time i had seen him, and he was fantastic, especially against Johanson
Wimbledon, the win against Stepanek, and then of coarse the match against Nalbandian, where he was soo close to winning. (And i publicly apologise to my french exchange for forcing her to sit and watch that match, on her first day in England! My mum kept telling me to take her out, but i was not going to miss that match, so im sorry French Exchange for forcing you to sit there for like 3 hours, obviously bored!) But not just the tennis, i loved the way he was on court then, celebrating all the time, and trying to get the crowds applaud going (which all seems to have mysteriously dissapeared, but that doesn't really matter).
Thailand obviously, just showed he could beat top 50 players, and even top 30, like Ginepri.
This is one that most people wont have, but the Davis Cup against Switzerland, i know that generally Britain performed quite bady, winning nothing, but watching the doubles match Murray played some amazing points past Federer, and that made me think that, even with Federer on the other side of the court, he can play some amazing shots.
Finally the Tim Henman match, and of coarse the tears at the end