What's the wordpress plugin that emails someone after they comment with a welcome msg? I've seen this a couple times and can't remember the plugin's name.
I'm going to try it out soon and will share. I currently run on a pretty beefy dedicated server though so I won't notice any load balance issues I'm sure...
Runs great. Really easy to work with. I just upgraded to WP 2.31 and it runs fine on it. If you'd like to test yourself go to my blog: ChrisGuthrie.net And make a comment.
It is called: Comment Relish. (as previously mentioned above) And it works great, i use it on my blog, and it is a normal plug-in download. Nice and Simple.
Comment Relish sends around auto responders. The alternative is 'Contact Commenters' http://wordpress.org/extend/plugins/contact-commenters/