Putting aside whether it's a good idea or not to make the immediate area around your computer humid, this USB humidifier helps make offices and homes with dry air a little less dry. It fits 40-150ml of tap water and starts misting when plugged into your USB port.
There's an automatic shutoff valve after 2 hours of use, and costs $39. We might actually consider buying this thing if the USB cable is long enough to get it far away from our precious equipment.
Product Page [Brando via Shiny Shiny]