NAND shouldn't be thought of as 'another place to stash stuff', its really a more 'precious' storage mechanism than other media, because it does, in fact, wear out. you want to write to it as little as possible. its not like 'flash-ram', which you can burn and read as much as you like, NAND will eventually fail. and some users, not knowing this about NAND, might indeed use it as a 'disk' just like all other, and after the 100,000th bit of reading/writing, end up with 'holes in the disk'.
NAND is protected in Linux, you have to treat it properly, because its often there and needed by the system to make boot .. but perhaps there will be simple hacks in the future to allow 'burn favourite games to NAND' in the gui shell at some point.
it'd be nice to have a 'put favourites on-board' option that treats NAND like a game-stash, but for sure .. i don't think its wise to consider NAND as just 'another built in disk' ..
speaking of this, i got myself a small stack - yes a stack - of SD cards today, 512 meg'ers, nice and cheap. its like the good ol' gb days, only all the 'carts' will be fully home-brew/open-source/media collection.
sweet.