i hope you can forgive the shameless self-promotion...but we've just released a major update to our Aji Reader and Aji Annotate iPhone PDF apps, and it seems like they might be very relevant to the discussion here. and for a limited time, Aji Reader is free -- we encourage you to check it out!
we have some demo vids posted at: http://www.youtube.com/user/ajiapps
we know that e-book readers make up a huge part of the mobile PDF reading community, so we've definitely worked hard on making our apps work well for this purposes. but please drop us a note (www.ajidev.com
) if there are any other additions you'd like to see!