Another blog on GTD/productivity just published an interesting idea, which is basically to use a Moleskine Memo Pockets (6 pocket-sized pockets) as a combined replacement for your wallet and your hPDA. I’m thinking it might also be a great idea to just use the Memo Pockets for a mobile GTD system (similar to the Moleskine Info Book with GTD hack). There are lots of pictures of the Memo Pockets in action on Flickr: the combined wallet/hPDA, and other GTD uses.