not sure if this was already covered, as it seems to be 6 month old news, and I wasnt exactly here that much during thoes months but..
I recall a much hyped (on dcemu at least) memory card that had some kind of loader that would allow you to run homebrew code from a memory card... today I thought about this, so I googled it and found this... gcdev.com link. (yah, if this hasnt been covered yet, some one should be shot). anyways... read...