This is cool a full size bluetooth keyboard that folds up to just 5″ x 3″.
It folds up to a remarkably slim, pocketable slice of metal. When unfolded, it automatically turns on and connects to a paired Bluetooth device. It is comfortable to type on, and works with a huge array of products including plug-n-play with any Bluetooth-enabled PC (especially nice with the OQO, Sony UX, etc.) and also smartphones/PDAs (Windows Mobile, Palm, and Symbian S30 3rd like the Nokia E-series).
The stowaway keyboard is available from dynamism for $149.99.