Yesssss this is right up my alley with my current projects. I'm working through K&R 2nd Ed and making little demo apps with libnds using framebuffer manipulation for graphics along the way. My goal is to eventually end up with a useful 15bit sprite-ing application, and an endless scrolling handwriting journal thingy with bookmarks. Thank You for posting this! I'm loading this onto my DSi XL right now.