The problem with elven cameras like Canon's S90 is that they're awkward to hold sometimes. Richard Franiec's custom grip - CNC-machined from a block of aircraft-grade aluminium and black-anodised to match - adds just enough extra surface area to fix that.
It stays just about as pocketable since the grip sits 1.5mm below the lens, and is attached to the camera with very high bond adhesive tape (meaning you can take it off without screwing up the camera's finish). It's 33 bucks American, which isn't a bad price to pay to make one of the best point-and-shoots on the planet even more usable. [Lensmate via Gadget Lab, Richard Franiec's Picasa]