I just saw the commercial again (the one that I'm thinking about).
They've got customs agents (or whatever they are) cracking open a ship's cargo container with Nintendo crates in it, as if they were drugs.
Then they have a police APB style announcement come over a radio-sounding thing, saying "Be on the lookout for hit new titles, like Need For Speed Underground, Mario 64, and Metroid Prime Hunters: First Hunt", while running game footage from those games.
I don't think it's a very good commercial. Oh yeah! Buy a DS for Mario 64! That's apparently all it's good for. N64-ports. And show lots of uncomplimentary game footage! They're probably better off not airing this kind of ad until they get some better games on the DS.
BTW, I'm pretty sure I've seen two other versions of this commercial, one with Ridge Racer DS, and the other with Rayman DS, both in the place of Need For Speed. Mario 64 and First Hunt were in all three, IIRC.