Just as I decide to go looking for it or actually attempt writing something there's a thread on the MangoBlog forums!
What is it? Well its an automatic blog aggregator pinger. When you post a new entry to your blog it will send a ping to your favourite aggregator, such as ColdFusion Blogger, Technorati, IceRocket or Feed-Squirrel to let them know that you've updated your blog.
Handy for letting everyone know you've written something without having to email them all or have to visit your blog. Nice work Russell! Thanks!