at the very least they need to allow developers to send to other applications for saves. such as Pages should be allowed to save to my Dropbox application (were the Dropbox devs willing to implement this on their end, etc)
the only other big improvement i'd like to see for iOS (mainly on iPad though) is a services menu of sorts like OS X. it makes the most sense, this explains it the best:
http://releasecandidateone.com/221:a_services_menu_for_iphone
Wow now that is an amazing idea. And yes, I always tried to use OSX Services but never really understood how they were used. LOL!
With iOS it would be simple.