If you do use 'whispernet' for delivery of personal documents, you'll only be charged if it uses 3G for the download. WiFi delivery will be free.
In terms of PDF annotation, I hope that Amazon is leveraging the Adobe Reader Mobile SDK's annotation API's, so that the highlights and notes are saved back to the PDF file where they can be read by any PDF viewer, and so that existing PDF text highlights and 'sticky notes' can be viewed and edited (the current K2/DX implementation allows viewing of annotations, except for contents sticky notes, which just show an icon where the sticky note is placed). We'll know soon enough...
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