One other thing too that I don't know if anyone has ever raised anywhere
is that other typesetting applications that store their project files in
some kind of proprietary or binary format will probably not be very diff
friendly. A big advantage to anything TeXish is that it makes
collaboration on a large document much easier because it can be typeset
using plaintext documents.

-- 
Kip Warner -- Software Engineer
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http://www.thevertigo.com