Very sorry for the delayed response and release of the latest version of Version Verification Tool. We're in the process of moving the VVT extension to GitHub, where it will be publicly available and better maintained. Additionally, the tools to generate the XML file for checking each file will be available there, allowing people to generate any diffs they want.
We're planning to have that up by the end of the month as well as a new release for Joomla 2.5.
With the update manager in Joomla 2.5, the need for VVT seems to have been reduced. We still understand the value of the extension, and plan to keep it more up-to-date with future releases though.