stylus
Are you doing handwriting with your iPad, such as a digital but handwritten signature, to sign papers?
I have a stylus with a rubber ball on the bottom of it. It works really well, specifically on certain types of games (match3 games work well with a stylus).
However, to type papers, I use my fingers. I am actually faster typing that way, than I am while holding a stylus. I think this is because I am only typing with one hand, while I can use two if I touch the screen myself, just as you would on a laptop. I just got my stylus, so I am sure there are more things I can do easier on it.
For a keyboard case, are you talking about keyboards that will transfer what you type to an iPad's screen? I have not tried that yet, but again, I rather just touch the screen or use my desktop computer.
Hope this helps.
Sarah