Justin Scott wrote a good tutorial explaining how to programmatically create posts (ie: posts coming from a feed or another CMS) using the API. You can read more at Justin's blog.
In version 1.5, I cut down the amount of logging stored when a plugin has an error. Adam Tuttle explains how to enable additional information to be logged when you are debugging a plugin or an error. Read at Adam's blog.
One problem people had when using Mango on Railo on Tomcat is that they need to change the settings to not use friendly URLs. That also happens with ColdFusion if you are using it on top on Tomcat.
Indiver Nagpal describes the changes you need to make to make it work with the
default friendly URLs.
In part 2 of Adam's series on how to create pods for your Mango blog, Adam explains how a plugin can show a pod. Using plugins for pods allows you to add as many pods as you want, and those are not dependent on the theme's built-in template pods.
Adam has written a guide on how to create Mango pods. In this first part, he covers simple template pods. Those are pods that must be added to the skin template. A must read if you create your own skins.