[Tyrannosaurs]

uPad on the iPad works pretty well for me for this though having tried a few different apps I quickly became aware that individual workflows and requirements vary massively for the seemingly simple requirement "taking notes on pdfs".

http://www.appsafari.com/notes/16761/upad/

[jessriedel]

Have you used a tablet with a native stylus? I have heard that the iPad's capacitive screen doesn't handle this so well.

[Tyrannosaurs]

I've got a cosmonaut stylus which I'm pretty happy with on the iPad.

Broadly speaking I don't like a the idea of a tablet with a stylus as it would be better for a small number of use cases but worse for a far larger number.

The screen doesn't handle detail brilliantly for handwriting but uPad gets round this by giving you a larger writing area which it then shrinks onto the actual document. Basically you write an inch high and it crunches it down to about 40% of that. It works pretty well, though I'd still use the keyboard for significant text input - it's completely workable once you get used to it.