Free homebrew multimedia-related applications for the Nintendo DS platform. You will find audio players of various forms (sequence/tracker stuff included), music creation tools (timing, tuning and such), painting tools, bookreaders (including PDF) and a handful of video players (including Moonshell).
Anbernic's SP clone will be $60 and I think I'll buy it. Looks decent enough and it will stop me from drooling over every single new handheld that comes out.