I received the feedback that my overview pages are difficult to read. I recently spent some time to enhance the usability of http://www.vogella.de.
Before the change the page looked like this:
I introducted now sub-categories which are used to structure the articles in a logical way.
Now it looks like this:
My hope is that this improves the readability and helps to find articles more quickly.
Let me know what you think. Are there other improvements you would like to see?