[funsi]

You should think of including support for latexdiff (http://www.ctan.org/pkg/latexdiff). People will love that I believe.

[jpallen]

Yes, we'd love to do that. I coded up a prototype a while ago and found that latexdiff can quite easily get confused and produce LaTeX code that won't compile. I definitely plan to revisit this though and try to get something working.