At School of Everything, we have been spending the last few weeks working with notifications. I wrote up the experience for Drupal.org, and also produced some documentation. Unfortunately, my documentation got a little lost on Drupal.org, so I thought I would make a post here to show them off a bit better. 

The main version of the doc is in PDF format, and you can find it on our, rather sparse little tech page on Everything. 

There, my ego is now all stoked. But, when I can get a few more people using the notifications module, I will be even happier.