I am thinking about getting a DSi but I wondered about the DSiWare stuff. If I buy some games, using my credit card, what are they linked to. Do you create an account for DSiWare, or is linked to your DSi. Can I backup the games somehow in case of a failure, or perhaps a problem with the SD Card, or what if I get a new DSi to replace an old one. What if I format my SD card, can I redownload anything I have previously purchased. I can't find any info about how to go about this.