Nintendo posted the Super Smash Brothers Melee and Pikmin commercials here. Each one weighs in at 5 mb.
On the one hand, there's the Pikmin commercial, which is 98% game footage, with a very cute, nature show style voice-over observing the Pikmin. I really like this commercial, as it manages to do a pretty good job explaining the basic idea of the game without being too convoluted.
And on the other hand, there's the Super Smash Brothers Melee commercial, which has about 20% game footage. This, to me, was a pretty typical game commercial that would have been better served with less sword fighting at the beginning and more Melee game footage at the end. For example, they should have included a game selling shot of Link smashing the hell out of Pikachu. Oh well.
As long as I'm talking about both Pikmin and Super Smash Brothers Melee, let me share that Super Smash Brothers Melee has a kind of neat treat for you if you have Pikmin save data on the same memory card as your Melee save data. It's nothing so cool as another playable character, but it is cute, and it amused me.