You absolutely can. You just need to buy a homebrew cartridge that works or DSi. Avoid any that don't specifically mention the DSi, as the old crop only works with DS lite and DS phat. Here's two:http://www.dealextreme.com/details.dx/sku.18944http://www.dealextreme.com/details.dx/sku.18728 <-Most reccomended.In either of the models I mentioned, you also need a microsd card (you can get that from anywhere that sells digital camera or computer stuff).Once you have the card, you'll need some homebrew for it. For movies, try this: http://dsvideo.recoil.org/ Just download it and put it on your memory card. You'll also need to download their conversion software to convert your movies for it.