I've spent part of today scoping the screens for a new iPad application for a client. I normally use the wonderful Omnigraffle for this type of thing, so went hunting for iPad stencils for Omnigraffle and found:
This worked perfectly (just download, unzip, and place the stencil files into users/library/application support/omnigraffle/stencils.
These guys have a nifty app called Writer that I really must take a closer look now I know that one of my gods Stephen Fry knows its name.
David Eedle 