Thanks for the complements.
Originally Posted by MrWarper
I just imported annotations, exported them to a new PDF and saved them as a native Xournal file without a glitch, and I'm talking a 402 page PDF here no less -- edit: 402 annotated pages, more like 500 in the original).
Note that xournal only handles PDF up-to version 1.5 well. Higher versions might lead to rendering the page to a bitmap and merging the annotations with it. Since memory is not very well managed (it was written for desktop-computers) this will lead to problems even with medium size documents!