Where do you put your project specific settings?

(defmacro project-specifics (name &rest body)
  (declare (indent 1))
  `(progn
     (add-hook 'find-file-hook
               (lambda ()
                 (when (string-match-p ,name (buffer-file-name))
                   ,@body)))
     (add-hook 'dired-after-readin-hook
               (lambda ()
                 (when (string-match-p ,name (dired-current-directory))
                   ,@body)))))

(project-specifics "projects/zombietdd"
  (set (make-local-variable 'slime-js-target-url) "http://localhost:3000/")
  (ffip-local-patterns "*.js" "*.jade" "*.css" "*.json" "*.md"))

I created this macro to help me set up local vars. So in the example, any files in projects/zombietdd will see these slime-js-target-url and the find-file-in-projects patterns.

I keep these in a projects-folder to keep track of all the different settings for my projects.