I've seen this subject debated on the WP forum and on a few blogs at the time this feature was released. It's a great feature for some situations, but most single-user blogs are rarely going to have the need for this feature.

The first thing I do when prepping a wp-config.php file for a new WP install is to include the following beforehand:

/** Change X to the number of post revisions you want WordPress to save to the database **/
define ('WP_POST_REVISIONS', false);

I turn them off completely, as I don't want the headache of having to go back in and remove the old revisions from the database.

PS/Jeff, seems you didn't install the Filosofo Comments Preview plugin on this blog. Could that be installed on this one too? :)