While I was I was looking for an organizer insert for a messenger bag (I found TB and ordered the Horizontal Freudian Slip), I came across this Instructable:

The pockets detach and are reconfigurable via velcro.
It strikes me that this is the sort of thing of which I would very much enjoy having a Tom Bihn version. It could be very useful as well in bags not of TB manufacture, and thus draw more into the TB fold. I like the idea of being able to quick change bags. Just pull the organizer base and drop it in the new bag. The customizability is a fantastic idea. I can have as many or as few pockets as I want and in the shapes, styles, and placements which I want. Oh, I can see this being a font of constant accessory purchases. Its bag-org nirvana! Any ideas, thoughts, suggestions?