1. Donkey Kong 64
2. Spyro: Year of the Dragon
3. Rayman 2! (This one is totally forgotten)

Crash Bandicoot 3
Super Mario World
Super Mario Bros 3

1. Jak & Daxter

2. Super Mario 64

3. LittleBigPlanet(Doesn't really deserve my number #3, but the amount of fun I have with my friends in this game is just WIN)

1. Psychonauts
2. SMB3
3. LBP

1. LBP
2. Shadow of the Colossus
3. Crash 3

Pyschonauts
Super Mario Galaxy
Sonic & Knuckles

@Night

ooo....SotC, I would've voted that but for some reason I don't think of it as a platformer, even though platforming type objectives is alot of what you do.

After reading the thread, it's difficult.

Here are some that are exceptionally good.

Super Mario World
Super Mario Galaxy
Super Mario Bros. 3
Crash Bandicoot 3
New Super Mario Bros.
Super Mario 64

It's too difficult to rank them. You may as well say rank your children.

EDIT: Damn, how could I have forgotten this? Jak and Daxter: The Precursor Legacy

1. Little Big Planet.
2. Super Mario World.
3. Super Mario Bros. 3.

So the platforms move and attack you.  It's still platforming at it's finest.  The only reason LBP is ahead is because it was more fun.  But SotC was far more emotionally engaging.