extremely interesting announcement.
In Japan by Feb 2005 Nintendo will be releasing a DS memory-card adapter for the transfer of MPEG-4 video and MP3s(32 - 320kbps) to the DS. It will use a GBA cartridge with a slot for SD media (DS. SD. Makes sense.) and will be backwards compatible with the GBA. It will retail for about $50 US - although no immediate plans exist to distribute the product in the US.
Nintendo: Please release this in the U.S. soon.
Nintendo has explicitly mentioned ripping TV shows and taking them with you - and I, for one, find it hard to imagine Nintendo releasing a media player that only uses one of the two DS screens - as GBA cartridges currently do.
If you agree - then this implys that access to both screens and potentially both processors is possible from the GBA slot - a tantalizing capability currently unconfirmed. As if this announcement weren't exciting enough without the ancillary possibilities for misuse.
If true, this means a way to reuse those writable GBA flash carts to load DS software including DS Linux, homebrew software and all the rest....