I think it can be good in some cases, and I really applaud Michele's efforts. This is an ongoing issue.

What I think it boils down to, and Carl touched slightly on it, is that a large group of these people already know this.

From experience what I see is the need for education and the continued pounding of these messages into a large percentage of users. And that's easier said than done. For individuals who have been told and told again about the importance of security, this plugin will give them some friendly reminders and hopefully push them to do what needs to be done.

For the others, who have heard it's important, but also have been taunted with horror stories of update failures, or have not been even educated on the importance, even reminders won't help. They are literally scared to death of what may happen when they update.

It's an ongoing issue as I said before. I see more people who are really starting to grasp the importance, but at the same time we have a long way to go. Maybe we need to start instilling confidence instead of being hell bent on filling them with fear. Overall, personally, with my own site and clients sites, I am seeing less and less issues with updates.

Anyway, that's my .02 :)