Now after GNOME3 is officially released more and more users are using it. First thing everybody realize is the non-existing tool to customize GNOME3 as you like it. Sure their is the gnome-tweak-tool but that isn’t really full of features.
I have found an interesting blog from Finnbarr P. Murphy which I want share with you: http://blog.fpmurphy.com
He is explaining several topics about customizing the GNOME Shell or writing GNOME Shell extensions. Have a look at these great articles.