Here are some very general links on operational transforms, in case
this is the sort of thing you're looking for:
http://www.scribd.com/doc/16920955/Google-Wave-Under-the-Hood
http://en.wikipedia.org/wiki/Operational_transformation
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.27.3253&rep=rep1&type=pdf
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Elliot
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Elliot