Well, I would've thought a light meter app would be kinda handy (if not already available FOC).
Hugo808: It's an interesting question, but after reading the forums here people seem to fetishise the perceived improvements of the next model in the shop as though this will somehow improve their photography, so cameras can never get familiar enough to be cherished as objects. They are just temporary tools that the manufacturers are only to keen to see us replace.
It's not like the old days like when my Pentax spotmatic was used weekly for 20 years, that won't happen with a D90 (if you remember even that far back!)
It's a tool. A means to an end. Maybe redundant SLR and DSLR bodies will become jewellery much like VW bonnet/hood badges, thus become adornments or you could fill them with cement and use them as paperweights or doorstops, thus they become useful objects.
Bottom line is who gives a stuff?
Why not just get a roll of McNett Camo Form Self Cling Wrap if you want a reusable solution to say an expensive lens-coat or other application for your tripod, monopod, binos or virtually anything else? It leaves no residue and protects from knocks etc, and this gimmick is double the price and has a very limited use.