yes it does need a memory card but,it does not come with one when you buy it,that"s about the only problem if you buy a dsi XL it has more features and a biger screen,a real looking pen(its just a easyer to hold pen).
nintendo ds: no nintendo dsi: yes(but needs acompatible memory card)
No, you do not.
Yes, the DSi (and XL) use the same memory cards as the Wii does.
No, but it helps if you want to store a lot of media because the DSi only has a limited amount of space. But music can ONLY be stored it on a SD card and NOT the DSi's memory.
Cartridge-based games will save to the cartridge. A memory card is necessary only if you download DSi-ware games from the shop.
No, only the DSi has an SD card slot.
It doesn't come with one, but it has aq slot for SD memory cards
http://www.bestbuy.com/site/SanDisk++8GB+SDHC+Memory+Card+for+Nintendo+DSi/9317303.pid=1218084030882&skuId=9317303&st=dsi&cp=2&lp=1 or... http://www.bestbuy.com/site/SanDisk++4GB+SDHC+Memory+Card+for+Nintendo+DSi/9317296.pid=1218084033076&skuId=9317296&st=dsi&cp=1&lp=15 They are the official SD cards of the Nintendo DSi.
The Nintendo DSi supports SD and SDHC Memory cards, and it should also support MMC, but I'm not 100% sure.
The original DS and DS Lite cannot take a memory card at all. The DSi takes SD memory cards.
The Nintendo DSi cannot save pictures without an SD card. SD card must also be compatible with the Nintendo DSi to be able to save photos.
You need a credit card or a nintendo dsi card.