Tim Schuerewegen has successfully hacked the DS' wireless mutliboot features to allow him to load custom DS much like the PassMe method by using custom drivers for Windows and a PCI card.
His post on the gbadev.org forums pretty much sums it up:
Finally some very nice progress on the wireless homebrew front. With dsdev doing quite nicely, i hope that major tutorials will be released in the future, and this site to have links to those examples.
For now, enjoy yourselves and these videos. The future is not far away!!