Well looked after powerbook 12 inch, the original 867Mhz model.
RAM bumped to 640MB
HD 40G
New battery last year.
Runs leopard well. 
Currently being used as a print and time machine server.

Perfect as an email/internet extremely portable machine or use as I have in your study as a second machine.

Smaller than a macbook.

Comes with VGA and S-video adaptors.
Shipped with Jaguar, will throw in copy of leopard and ilife 08.

One of these sold recently on Tradme for $670. With the software above included, looking for about the same price.

Cheers,

Alistair

PM me if interested.
EDIT: sold on trademe