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.

Adam Harley (Kawauso)

Checks for the presence of the <code>.svn</code> directory in each plugin’s directory. Disabled for plugins with their files directly in the <code>/plugins/</code> directory to prevent false positives.
Also supports other systems through the use of the <code>REVISION_CONTROL</code> constant. Just set this to the directory created by your revision control system in your <code>wp-config.php</code>
Based on <a href="http://developersmind.com/2010/06/12/preventing-wordpress-from-checking-for-updates-for-a-plugin/" rel="nofollow ugc">code</a> by PeteMall.

No Updates for Plugins under Revision Control

Prevents plugins from being updated by the WordPress updater if they are under Subversion revision control (or other systems).

Show SVN Revision vs No Updates for Plugins under Revision Control