You can't.
Go to the Sony Reader software, and you'll have to export your notes from there. On a Mac, just open in a text program (Word, TextEdit, etc), and print to PDF.
The notes function is great on the 600, except there is no easy way to get them out, and you're limited to 100 characters each time. HOWEVER, you could copy and paste text into annotations BUT ONLY IN THE READER SOFTWARE, and you're not limited to 100 characters. You can't do that on the reader itself.
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