DanCoulter

This plugin allows WordPress testers and administrators to display the revision and path of the Subversion working copy that their WordPress installs are running on. The information goes into a line in the admin footer. This line can be removed in favor of a tooltip if that is preferred (see installation instructions).

Show SVN Revision

Adds the revision and path of your Subversion working copy to the admin footer.

dajulia3

Adds revisions (version control) for WordPress theme files. Adds a version viewer to the theme editor. 
You can write your own adapter plugin to use the VCS of your choice, or just use the default 
database-backed VCS that comes with the plugin.
For instructions and help for both users and developers, see <a href="http://dajulia3.github.com/WordPress-Theme-Versioning/" title="WordPress Theme Versioning Documentation" rel="nofollow ugc">The Official Documentation</a>

Theme Versioning

Adds revisions (version control) for WordPress theme files. Adds a version viewer to the theme editor.

Show SVN Revision vs Theme Versioning