Via Asa Dotzler blog.
Here is a great way to make sure that all of your software users are using the latest stable release, which usually fixes security issues and various bugs discovered: silent updates.
As he writes:
It looks like the folks at Google turned on the automatic (silent) update for Chrome beta users today. They should have all of their users on the latest version in just a few days
Written by Vygantas Lipskas on December 16, 2008