Here's an unusual one... A wireless keyboard that rolls up and houses a detachable bluetooth speaker. It's called the Compectus and is currently featured on Indiegogo. This keyboard is incredibly slim (to facilitate the rolling function), features several function keys and rechargeable battery. The design of the Compectus is very similar to a keyboard manufactured by LG called the Rolly though that keyboard does not feature any built-in sound.
Compectus Rolling Keyboard - Compectus - Bringing innovation to your fingertips
This is a nice roll-up keyboard. The speaker stand looks useful for users who want better sound, and a stand to hold their smartphone or tablet while they type on the keyboard.
I think this rolling keyboard is useful for laptop and desktop PC users who connect their laptop or desktop to a TV or large monitor while the user use a desk which is farther away from the PC. Some built-in speakers on cheaper TVs and most monitors also don't sound very good, so having a separate external speaker can be useful for people with TV and monitors with bad sounding built-in speakers.
