The Skim Import plugin converts notes exported from the Skim PDF annotation tool ( http://skim-app.sourceforge.net/ ) into a format that displays nicely in Moodle.

So a portion of an exported RTF file that looks like this:

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• Anchored Note, page 1

SUMMARY

NNS of Spanish chatted online with NS outside of class time. NS were teachers in the US of Hispanic origin, grad sts and older than the NNS. 

• Underline, page 1

outside of class time

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might become like this

============================

SUMMARY

NNS of Spanish chatted online with NS outside of class time. NS were teachers in the US of Hispanic origin, grad sts and older than the NNS. (p 1.)

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 Nested note styles are also supported. e.g  underlines within highlights.

A video of the installation process  can be seen here.