One Quickie

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Using carriage returns in query-replace / replace-string (emacs->General)

Use C-Q C-J (control-Q control-J) each time you want to include a carriage return. e.g. to double-space everything

M-x replace-string RET C-Q C-J RET C-Q C-J C-Q C-J RET

Or to put "bloogie " at the beginning of every line

M-x replace-string RET C-Q C-J RET C-Q C-J b l o o g i e SPACE RET