PVCS-access is a project mainly written in Vim Script, it's free.
Difference and browsing abilities for a PVCS archive.
This is a mirror of http://www.vim.org/scripts/script.php?script_id=1178
Allows PVCS users to view differences by previous version, specified version, or between two versions in vdiff or gvim diff formats.
Allows user to browse all archive versions of the current file.
Tested with version 6.0.10. Refer to your PVCS documentation for support.