ReallyCool Keyboard is absolutely silent, waterproof  Silence
that keyboard! That clickety-clacking all day long gets
annoying, so that’s why these absolutely silent keyboards exist.
Not only is the full-sized ReallyCool Keyboard quiet, it’s
waterproof, so you can scrub it with soap and water if you’re in
an environment where things get too funky to touch. Even more
appealing is its backlighting, for, say, typing next to a
hospital bed in the middle of the night.  Marketed to medical
facilities, these silent keyboards are seeing use in courtrooms,
too, where the distracting rat-a-tat-tat of typing tests the
temper of judge and jury. According to its maker, the ReallyCool
keyboard has tactile keys, giving you a normal-feeling typing
experience even though it's not particularly ergonomic. You’ll
have to pay extra for all that ReallyCoolness, though — it's
$199, in your choice of black or cool gray.  Via Man & Machine