Possibly one of the coolest retro-fits I've seen in recent times is the USB Typewriter which you can purchase as a complete typewriter already retro-fitted or you can buy a kit to retro-fit yourself. I have to say the typewriter looks particularly cool when paired with an Apple iPad (as per the video below) but the conversion effectively turns your type writer into a USB, computer keyboard that can be plugged into any compatible computer that recognises a USB keyboard. I reckon it's the ultimate gift for writers who dream of locking themselves away in some beach side cottage with nothing but an old mechanical typewriter and a romantic notion to write that ultimate best selling novel. Just be careful you don't get so nostalgic that you start using Liquid Paper on your iPad's screen!