As far as "world's firsts" go this is a pretty minor one, yet we'd be neglect in our duties were we not to present you with the Silver Seal Antibacterial, Washable Keyboard and Mouse, which manufacturer Seal Shield claims to be the only set combining both of these hygienic features.
Designed for use in hospitals and other germ-laden environments, the Silver Seal desktop features those same silver ion nanoparticles that have become all the rage among hypochondriacs these days, and is totally submersible (dishwashers, too!) to expedite regular cleanings.
Hospital IT procurement specialists should start looking for the set next month, and although no MSRP is available yet, we'll wager that you're looking at diNovo-level pricing.