This is a Linux driver for ThinkPad laptops, written by Borislav Deianov and Henrique de Moraes Holschuh. It aims to support various features of these laptops which are accessible through a ThinkPad-specific ACPI framework. The newest version is available in the latest version of the Linux kernel.
These tools aim to Toshiba-Laptop users, who want to use their extra keys to control the brightness of the LCD or to control the fan.
It even lets you use the extra multimediakeys on the newer Laptops to control xmms, a dvd-player software, etc.