Need an App for the iPad/iPhone that is sync-able

Would LOVE to be able to write on my Mac Mini then continue working on the same file on my iPad. PLEASE add an App for iPad and/or iPhone so that I can be productive away from my Mac mini. Right now I have to use Pages to work remotely, then import into the iBooks Author. Trying to edit what I have already worked on in iBooks Author is even more of a nightmare. There is no editing in pdf format, not to mention trying to re-import it afterwards to sync with my iBooks Author file. The App is great for finalizing work, but not really helpful for work-in-progress.

Lumunus about iBooks Author