org-projectile provides functions for the creation of org-mode TODOs that are associated with projectile projects.

Install from MELPA with M-x package-install org-projectile. See the melpa repository for details about how to set up MELPA if you have not already done so.

Before using org-projectile, you must specify the file you would like to use for storing project TODOs, as well as a keybinding for taking a project note with org-capture and a global keybinding for org-projectile-project-todo-completing-read. It is recommended that you start with the following configuration:

(require 'org-projectile)
(setq org-projectile-projects-file
      "/your/path/to/an/org/file/for/storing/project/todos.org")
(push (org-projectile-project-todo-entry) org-capture-templates)
(setq org-agenda-files (append org-agenda-files (org-projectile-todo-files)))
(global-set-key (kbd "C-c c") 'org-capture)
(global-set-key (kbd "C-c n p") 'org-projectile-project-todo-completing-read)

Here is the same configuration expressed using jwiegley’s excellent use-package:

(use-package org-projectile
  :bind (("C-c n p" . org-projectile-project-todo-completing-read)
         ("C-c c" . org-capture))
  :config
  (progn
    (setq org-projectile-projects-file
          "/your/path/to/an/org/file/for/storing/projects.org")
    (setq org-agenda-files (append org-agenda-files (org-projectile-todo-files)))
    (push (org-projectile-project-todo-entry) org-capture-templates))
  :ensure t)

If you would prefer to have an org file for each project that resides in the project directory, add the following elisp to your configuration:

(require 'org-projectile)
(org-projectile-per-project)
(setq org-projectile-per-project-filepath "my_project_todo_filename.org")
(setq org-agenda-files (append org-agenda-files (org-projectile-todo-files)))
(global-set-key (kbd "C-c c") 'org-capture)
(global-set-key (kbd "C-c n p") 'org-projectile-project-todo-completing-read)

opens a projectile-completing-read that allows the selection of a project heading under which to store the input that is subsequently captured in an org-capture buffer. Completion candidates for this function are generated using the project list returned from (projectile-relevant-known-projects) and the existing headings in org-projectile-projects-file.

is a function that builds an entry that can be added to org-capture-templates in order to use org-capture to make TODOs for the project to which the current buffer belongs. You can access org-capture mode with M-x org-capture, but it is recommended that you bind org-capture to some key.

Both of these functions will create the relevant top level heading in the org-mode file stored in org-projectile-projects-file if it does not exist.

This means that if you run org-open-at-point when your cursor is over a linked heading, projectile-switch-project-action will be executed, and you will begin working in the relevant project. By default, emacs will prompt you about whether not to execute the elisp associated with the link. To disable this prompt, add

(setq org-confirm-elisp-link-function nil)

to your configuration.

The author’s configuration can be found here. Check it out for some ideas about how to customize org-projectile.