DanCoulter

This is a very simple and straightforward plugin to let you automatically blog the commit messages from your public Subversion repository. For now, only one project is supported.
Currently, it requires that PHP have shell access to the “svn” command. This means that it has to run on a *nix server with subversion installed. If you’re not sure whether your server supports this, try typing “svn info” at your shell. If it says that it cannot find the program “svn”, you don’t have it installed.

WP-Subversion

Automatically post commit messages from your public Subversion repository.

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.

WP-Subversion vs Theme Versioning