Please test this page to your heart's delight. However, I have only developed and tested this in Firefox (FF3.6), so it is most likely broken in all other browsers.
Oh, and if you don't get it, select some text, press Ctrl+C (or Cmd+C) and then press Ctrl+V (or Cmd+V) in some other place like word, an email, your messenger client or anywhere else you would like to share some text from this document.
Feel free to check the source of this very simple jquery copy-paste plugin.