Hi
In future I think there should just be one plugin, say VCdiff for all common version control systems. The behaviour should be very similar, just with different command names, which could be stored in an array. Then the user just sets an option for the VC they want (or perhaps it could even be autodetected by looking for CVS/.svn/.hg/... subdirectories).
I like the idea. Here is the first version of this plugin. It supports SVN, CVS, GIT. Comments are welcomed.
Best regards, Yura Siamashka