No Sites Folder in Mountain Lion after Upgrade After i upgraded Mountain Lion on my MacBook Air, i haven't any Sites
  folder in my home-folder.


On my Mac Mini there is still my Sites folder with all my local sites in it. 

How do i get it back? 


XAMPP is installed
XCode is installed
Developer tools are installed
Have you tried just recreating the folder and naming it the same thing? I don't believe the folder is created when you install developer tools. It should be there due to Safari.