We've come across many keyboard docks and casings for the iPad, but if you're a bit sick of the whole sleek and portable concept, then you might be interested in taking a look at this USB Typerwriter Computer Keyboard which works with not only the PC and Mac, but as pictured above, will work with the iPad as well, although granted it will probably cause quite a scene if you were to bring it out to Starbucks. The typewriter itself is fairly standard as far as typewriters go, those who have used typewriters in the past will know what I'm talking about.
Ubergizmo, USB Typewriter Computer Keyboard is compatible with the iPad
