I really wish they included inking support on the iPad app. I loved OneNote on my Tablet PC I had five years ago, and I'd love to use it today, but I handwrite all my notes on my iPad.
Which app and pen do you use for handwriting notes on your iPad? I've tried a few but I haven't liked any of the input interfaces. Writing in a small area of the screen is cramped, but when the whole screen is available to write (e.g. Paper, the drawing app) I find my arm constantly getting in the way.
I just use cheap styluses/ my finger for writing, as I find that tips wear our way too quickly to spend a lot of money on one. (although I would be open to the idea of a high-end stylus with a replaceable tip)
I use the adonit Jot Pro stylus, retina ipad mini and the adonit Tote case to keep the pen with the tablet all the time. ( http://www.adonit.net/ )
Not too worried about the bit of extra bulk as I can now chuck it into my consulting bag without worrying about scratching it up.
The reason i like uPad is that it presents a large space on the screen for you to write into, and then takes what you put in there and places it on the page. It means you get all the benefits of writing 'big' with palm rejection on the non-writing areas, but then all your notes go where you want by placing where the text will appear on the page.