MobileRead Networks
MobileRead Networks is a forum for people who use mobile ebooks. I read there about how to cut and paste from a plucker document on a Palm. Use View > Export to Memo which saves the current screen as a memo.
Depending on your needs this would be a simpler procedure than converting both an html and a text version of a Gutenberg text when just a short piece of text needs to be quoted (as suggested in a previous entry).