I Am Really Into Punctuation Right Now

I am copy editing the scanned text that will become the e-book version of Saving the Planet & Stuff, so I am probably more interested in the article Writers' Favorite Punctuation Marks than I would otherwise be. I, too, am very fond--perhaps overly fond, I'm thinking right now--of the em-dash. It looks as if the scanning process turned every last one of Saving the Planet's em-dashes into hyphens.