[KeynoteKen]

Apps in OS X place several versions of their images on the pasteboard and apps request the highest quality version they can utilize. Most apps in OS X are happy with the .PDF format, some apps aren't.

Try this, copy your text, open Preview, and do Command-N. That creates a new file from whatever's on the pasteboard. You should see that the file that gets created is a .PDF. So, the output from OG is a high res vector image for the apps that can accept it. I don't have Scrivener, but I'd imagine that it's not placing a high resolution PDF back on the pasteboard for RapidWeaver.