I'd have to agree that Crash Bandicoot is a magnificent game!
Apart from that, although the game is a bit ruined now, I'd have to say the MMO Silkroad Online. Probably mostly because of all the nostalgia feelings I have for that game.
But in terms of browser (flash) games, I'd have to mention the good old Playing with Fire bomberman game. I had so much fun playing that game with my friends when I was younger!