I've got a modestly large document (60 pages or so), of technical documentation, in two versions (one of them improved). Unfortunately, I seem to have lost the source of the older version (but I do have the code for the most up-to-date document).
I'd like to compare the two versions of the document (in PDF format) and see what got changed between the two, preferably in a
Not a whole lot changed between the two versions, but minor details are important and could be easily overlooked.
Suggestions how to to this efficiently and effectively will be deeply appreciated. Non-TeX related solutions also welcome, including non-free ones.
I should mention that the documents contain exclusively text, with very few figures and tables, and modest amount of formulae.
Edit: The documents were created with pdfLaTeX by myself, and if you think there's relevant information in the packages I used, I can provide that as well.
Edit 2: A lot of good and promising answers! I will make an effort to try them all one of these days, and will post an update here with the result. This might make a good community wiki.