Those Duo sticks are pretty small and I know that a 2GB SanDisk card is shipping this summer... so my question is - how big can these things get? Will we see a 5GB, 10GB or 20GB card in the future or is 2GB pushing it right now? If Sony ever wants the PSP to serve as my mp3 player as well then a 10GB better be in the pipeline (and prices need to come down - the 2GB is shipping for $350!)...