An... unusual list, and one that I disagree with (and one that is in fact completely wrong), but the writer is allowed his point of view. There was thought put into its construction, so I'm not going to complain too loudly, though that would be an understandable response. You lot can draw your own conclusions.
Tops in my mind are Bonds swatting #500 and #700. #500 because I was just starting to get into baseball, and because it marked the beginning of what would go on to become a magical regular season (a few other factors also at play). And the call, the call: "HIGH INTO THE SAN FRANCISCO NIGHT! IT'S INTO THE WATER!" Who can forget that? #700 was less dramatic, but I happened to be there, so woohoo.
A few others have stuck: Bonds drilling a long liner off of Schilling; Bonds hitting a key grand slam off Schilling; Bonds v Percival; Snow and the Mets; Gallaraga trying his best to hit the big mitt.
Too bad MLB is such a pig with its highlights, or I'd be reliving this stuff on YouTube right now.