Self censoring your company mail/blog

At Demo this week, InBoxer (aka Audiotrieve, LLC) introduced its program OutBoxer, designed to enable employees to reconsider content of emails and blogs before precipitously hitting "send". The product can be configured to adopt corporate rules regarding content, profanity, and presumably confidential information. In my view, a well placed concern, in this era of electronic discovery, hostile workplace litigation, and the misplaced belief that email is a "private" means of communicating. I'd be curious to see how difficult it is to implement across an enterprise -- and what role HR will play in the monitoring.