Thanks for your suggestions. However CakePHP was not specifically made for blog building..., Mindzai, that tutorial you pointed me to looks like it's lacking in-depth (I'd also have to familiarize myself with the MVC design pattern which I still don't fully understand :o ). That would be much more helpful than using plain PHP, but I would have to build all the implementation of my blog.
The main snag with CakePHP is that I'd like to have all the back-end and blogging management already implemented. And starting from this point, quickly write my own posts, implement some changes of code if necessary (PHP, MySQL, CSS, HTML, Javascript...), adding some plug-in, add my own add-ons in the future...
Now, Wordpress, which is specially made for blog building, is a real mess if I want to adjust some code by myself. So, would you suggest me other similar frameworks, platforms or whatever they're called which are cleaner and friendlier for programmers?