"Bayer’s DIDGET™ is the only blood glucose meter that plugs into a Nintendo DS™ or Nintendo DS™ Lite system. This unique meter helps encourage consistent testing with reward points that children can use to buy items within the game and unlock new game levels." Blood glucose monitor for diabetics that plugs into your Nintendo DS. Utterly awesome, and exactly what a new world of products should look like.

"Obama Says: Yes We Can is a Simon Says game based on Barack Obama's New Hampshire Primary speech, as later turned into song by will.i.am. Watch the game create a pattern of button and direction presses, and repeat that pattern correctly to score! The more you get correct, the harder the patterns become - can you keep up?" Oh blimey.

"With DS Reader you can read any e-book (or text file) on your DS. It even has a great little bookmarking function to keep track of your progress." Ooh.

Leanoard rounds up his favourite DS homebrew games. Some good stuff in here that I didn't know of.

Commander Keen on the DS. Heck yes. One of the first games I spent a *lot* of time playing.

"DS brut is an open source hardware prototyping platform for the Nintendo DS, developed by and for electronics enthusiasts, artists and game developers. By connecting the Nintendo DS to the outer world, the game console can be easily hooked up to a variety of sensors (e.g. GPS receivers) and can itself control all different kinds of actuators, servo motors and others."

Portal-inspired homebrew game for the DS. Looks rather sweet, although not keen on collect-em-up mechanics.

"It occurred to me that if I could somehow tether a DSLR to an instant-on device like an Arduino microcontroller I would have less weight to carry around and could get more work done. After mentally spec’ing out what I would need, I realized the solution was right in front of me - because I bring it with me for Mario Kart wireless races on long night jobs - (In the manner of John Lasseter’s slow epiphany voice): “Use-the-Nintendo-D-S.” Duh." Oh wow.

"VideoGamesHero brings you homebrew action at it's best - offering lasting fun and challenging action with over 65 Songs, 5 Game modes, Motion Card and Guitar Grip support, there is something for everyone!" Homebrew Harmonix-style rhythm action game for the ds. Awesome.

"glitchDS is a FREE homebrew Cellular Automaton music sequencer for the Nintendo DS. It’s perfect for creating IDM and Glitch style loops." Should only work with R4, but seems to work with several carts.

"NDS adaptation of the famous Warcraft mod". Oh my. DS Homebrew, I love you.

"Colors! is a simplistic digital painting application for Nintendo DS based on modern
painting-techniques developed for drawing tablets in programs like Photoshop."

"Not necessarily the completest 'best' collection, but some of the more notable games, applications and emulators that have grabbed my attention long enough to stay on my DS."

The first of Joe Deaver's adventure gamebooks translated to a rather beautiful NDS port.