Drupal 6's updated theme() function creates considerable more support for templates. If you've even looked at a Drupal 5 theme's files or the Drupal 6 core, you've seen them. They're the little .tpl.php files.
A template is a file designed to be friendly to the typical administrator. There is not supposed to be any complex PHP code there, because that would scare off many a user. They're lightweight files used to generate the equivalent of what a theme_function does. Variables can be passed into the template for use through a nice php function, template_preprocess_template_name().
The Drupal simpletest module is awesome! I discovered it while I was looking for a new GHOP task, and I loved the idea of it immediately. So, I claimed the task, and I'm writing now to share what I learned with you.
The simpletest module extends the php simpletest framework. Basically, it allows users to run a series of automated tests on a Drupal install.
Often, new code is entered into Drupal contributed modules, and even the Drupal core, without being thoroughly tested - or even tested at all, in some situations. With simpletest, tests become so easy (without having to manually try maybe hundreds of situations) that finding and fixing bugs becomes a breeze.
What would the advantages be of (theoretically, of course) having Drupal as an object-oriented content management system? So I answered myself:
GHOP stands for Google Highly Open Participation contest. It has started in late November, and will be finished by February. Already, an amazing amount of work has been completed. This project is succeeding at harnessing the power of people under 18 at quickly understanding new, complex things (that take adults years to understand) in less than an hour.
I am not surprised by this. Children and teenagers are smarter than adults, as has been proven time and time again. Google Summer of Code, aimed at college-level students, has not produced nearly as many results as this contest has.