usbrh reads temperatures and humidity from sensors of a "USB-RH",
which is connected to a USB port of the computer.

Strawberry Linux Co.,Ltd. USH-RH(Sensirion SHT-11)
WWW: http://www2.strawberry-linux.com/products/usbrh/

WWW: http://www.nk-home.net/~aoyama/usbrh/