It took me a long time to find out something to say about year 2000 in animation. This wasn't really special year for this kind of art, it actually missed at least one really memorable piece of animation. Or, maybe it's just because 2000 was completely different decade in comparission with today's animated movies...
Highest-grossing animated films of the year:
2) Chicken Run
3) The Emperor's New Groove
4) Rugrats in Paris: The Movie
5) The Tigger Movie
This list also contains some shorts. Movies are in no specific order. Some movies may be missing.