Have you actually used or tried to deploy ChromeFrame? Its plenty ready for prime time, and features:
1. A 60sec installation
2. No browser restart required
3. No admin rights necessary
4. IE6+
5. Autoupdate just like regular chrome
Even the most technophobic user can follow 2 links to be able to use an app they really want to use.
And remember this is all about applications, not your average brochure site.