Zen-960
UPDATE: Since writing this post ninesixty theme has advanced. I am now using it as my base theme, and create a subtheme. I no longer use Zen.
Zen is my first favorite base theme. Ninesixty is the other. The following post will show how we can enjoy both of them - How we can have a "Zen-960" theme _done correctly.
As always, lets first understand _why we want to combine those two themes.
JohnAlibn's Zen is a great starter theme - if you need a list of features, just head to the project page, you won't be disappointed.
dvessel's Ninesixty takes the power of grid 960 -that we really love as it allows us to spend less time banging our heads on CSS - and adapts it to Drupal.
The way that I look at it - Zen should be doing the job of defining the page _elements (how fonts will look, lists, tabs, etc') and defining their RTL equivalent. Ninesixty on the other hand should be doing the job of defining the page _layout.
So what is the problem? Well, according to Drupal I'm too griddy! I want my theme to have two base themes - and that's currently not possible. Ok, so why not just download zen_ninesixty theme (a.k.a Zen-960) and go on with my life?