The latest version of the Post Expirator plugin is now available!  I have fixed the compatibility issues with WordPress (still works on WordPress MU), added the ability to expire posts/pages on the minute and fixed the timezone issue to pull from the timezone configured for WordPress.  I have also done some initial testing on the 3.0 alpha trunk – and everything works as advertised!

The plugin can be downloaded at the WordPress Plugins Page.  Enjoy!