The USBTypewriter™ is the must have computer accessory for us old school types.
Lovers of the look, feel, and quality of old fashioned manual typewriters can now use them as keyboards for any USB-capable computer, such as a PC, Mac, or even iPad! The modification is easy to install, it involves no messy wiring, and does not change the outward appearance of the typewriter.
http://www.usbtypewriter.com/ - Via Nerdcore