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					Originally Posted by Britomart  I am almost embarrassed to ask, but where does one get these plugins? They sound extremely useful, but I have never heard of them before.    Do you add them to Calibre? | 
	
 Yes in the plugin screen on Calibre click 
Get New Plugins and you will find a whole bunch of goodies. I've got Epubsplit and Epub merge and several metadata plugins. Cover Resize one is another one I love.  Oh and Generate Cover for those books that need one. My most favorite is mobi unpack. It extracts the content of a mobi file allowing me to edit it! 

 It also extracts the new KF8 into a epub so there's no need to convert.