If  you want to make your own DS videogames without spending countless hours learning C++ and Assembler then XtenDS is for you. InvisionSoft has created a really this interesting homebrew that runs under Windows and let everybody create simple DS games that can be played on a real Nintendo DS trough a flash card. OK, you will not able to create the next Zelda but XtenDS is still really fun and it's a great software especially since it's free! Click here for a XtenDS  tutorial.