Hi again, I've put up a new version that will be especially interesting for SuperCard CF and M3 SD owners and perhaps also for other people who had trouble running it. The archive now contains a .gba.nds version that has a prepended loader and should work on Supercard CF. M3 SD owners will be able to access their SD-cards with this version, but support is still read-only. Thanks to Sata for letting me use his M3 code.
Also, I'm still overwhelmed by all the positive reactions I'm getting for this project. I got lots of nice e-mails and several people blogged about it, for example StoneCypher, createdigitalmusic and the make blog. Thank you all for your support, I'm very motivated to make this the best DS tracking tool possible!