During Nintendo's GDC keynote, Nintendo president Satoru Iwata announced that the upcoming 3DS handheld will support Netflix's streaming TV/movie service. The service will go live this summer.

Your movies or television shows will be displayed on the top screen of the 3DS. The Netflix servers keep track of where you are with a film so you could hypothetically starting watching a movie on the train home and then finish it on your Wii (or PC or whatever). I imagine they'll have an advertisement showing someone do just that.

To use Netflix on the 3DS, you need to have the $7.99/month streaming-only subscription or a more expensive plan. It's the same requirement as the console versions of Netflix.