Originally Posted by Ea
On a Mac you can just copy paragraphs and line breaks and paste them into the search and replace window.
To the OP: I would suggest using Pages for this - the search and replace seems to be more stable and a little easier to use than in Word. I've done this a lot recently with some books I've re-formatted, and whenever I start working in Word I often find myself shifting to Pages.
When finished, you can export from Pages to RTF - though I would suggest copying and pasting the whole thing into a new RTF document (TextEdit). It gives a 'cleaner' file. The RTF file can be converted in Calibre to for example ePUB if you don't like how RTF looks on the Reader.
To EA: You're correct about Pages. It's what I ended up using - both for its stability and ease of use with Find/Replace. Word couldn't hold the contents of the book for longer than 2 minutes before it crashed, regardless of what I did to fix it. Your photography is very nice.
To all: Thank you. I learn. The challenge is to remember.