We mentioned United Keys in July already as they hold a patent for display keyboards.
The United Keys 205PRO LCD Keyboard Keytop displays are 20 pixels by 20 pixels, in monochrome. The keyboard runs on USB 2.0, and comes with desktop software featuring a real-time Icon Editor and icon-to-hexadecimal Image Converter. Not all keys have the LCD display. Only the function keys sport the cool feature. The retail price of the 205PRO is $299.99, and will be available in the first quarter of 2006. Special 'friends and family' pricing of $199.99 is available until the end of the year.
More details in the United Keys press-release. First seen on Think Computers. They also have a couple of hi-res photos published of the United Keys 205PRO.