Ryan McCue has written an insightful post about caching data in WordPress with the Transients API. Most interesting to me is how he describes expiration in transients as a “maximum age” versus a “guaranteed expiration”. He also makes a worthwhile point about how even when you store transients, it doesn't mean they won't be expired at unexpected times when you try to use the data. This is highly useful for developers that are using transients in their custom web projects and plugins, to make sure you're getting the most out of your efforts.
If you’re going to be creating complex websites with WordPress, then you need to get serious about it. This series of posts is based on the Twelve-Factor App methodology, adapted for large scale WordPress projects.
Tom McFarlin discusses various methods for instantiating WordPress plugins. There are some good comments as well.
What if you want to show hidden information only to “administrators” or “shop managers?” What about displaying a custom “My Account” tab just for logged-in customers?
The wp-cli (command line interface) project has really been gaining traction. Scribu shows in this post how to easily setup unit tests for WordPress plugins using wp-cli.
Using this snippet, you can make Gravity Forms fields read only, or greyed out, by simply applying a CSS class to the field, thus disabling user edits to the field: useful for displaying information.
Brian Coords has been working on WP-Notify which is described on its GitHub repo as: A feature plugin for WordPress, which aims to create a new (better) way to manage and deliver notifications to the relevant audience.