For whatever reason, the average office building seems to be kept at a temperature at least 10 degrees F colder than most office workers seem to feel comfortable. This probably is either an attempt at a shivering-induced productivity boost, but the fact remains that no matter how many sweaters you wear, your hands are going to get cold while working at your desk. There isn't a heated keyboard (although my laptop does get pleasantly warm), but a Hand-Warming Mouse can definitely keep the chills away and your fingers flexible. Made by Thanko, the driver-less USB mouse can get up to a maximum 45C/113F. Price: $23.