Opening the iPad to add-on storage runs counter to Apple's philosophy that individual apps should manage data storage. The absence of a common file system is intimately related to the absence of local data storage options. And has already been noted, while solid state storage options have been coming down in price, adding a 128 gig to the iPad 2 lineup would have pushed the cost of the iPad well into MacBook Air territory. Even then, those who find 64 Gigs to be too small would probably not be satisfied with twice that volume.