How to use Mobile Org to talk to your Emacs Org Mode universe in the cloud.
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1. Learn org mode.  See http://orgmode.org/ for that.

2. Tell .emacs where you keep your org files, in particular the ones
   used for building your Org agenda, e.g.:

     ;; This is just an example.  The way you do it might be
     ;; completely different, and that's fine, as long as you wind up
     ;; with `org-agenda-files' set usefully.
     (custom-set-variables
      '(org-agenda-files (quote ("~/org/work.org" 
                                 "~/org/inbox.org"
                                 "~/org/hobbies.org"
                                 "~/org/people.org"
                                 "~/org/private/personal.org"))))

   Some people keep all their Org Mode files in one directory, but
   that's not strictly necessary.  You can have them scattered in
   multiple places, as long as `org-agenda-files' knows about them
   all.  The important thing is that they all have unique basenames --
   they're all going to live in a single directory on a remote server,
   so they must have unique names.

3. Find a host on the public internet where you have an account with
   SSH access.  Log in and create an (empty) directory in your homedir
   to store org data:

     $ ssh my-safe-host.digitalocean.com
     $ mkdir MobileOrg

   Note that you'll most likely be accessing this host via
   passwordless ssh from the machine(s) where you run Emacs, and via
   password-over-ssh from your mobile phone or other mobile device.

   If you don't fully trust your mobile devices with important
   passwords, that's okay -- just make sure choose a cloud host where
   compromise would not be a serious matter.

5. Tell .emacs where that server-side directory is. Note that the
   "/host:path" format below tells emacs to use tramp, which allows
   emacs to read/write files over ssh:

     (setq org-mobile-directory "/my-safe-host.digitalocean.com:MobileOrg")
     (setq org-mobile-inbox-for-pull (concat org-directory "/index.org"))

6. Push your org files to the server: 'M-x org-mobile-push'.

   Emacs tramp *may* prompt for your ssh password (unless you have
   ssh-agent set up properly, which hopefully you do), add new
   properties to your bullets, compile data, and push everything up.
   It creates a special 'index.org' file as well, which acts as a
   table of contents for all the data.

7. Install MobileOrg on your android device.  In the setup wizard,
   tell it you have an SSH account. Give it your SSH credentials, and
   the path on your server where the data lives (include the
   "index.org" at the end).  Whenever you click the "sync" button, it
   will read from the server.

   In some versions of Mobile Org, right afterthe initial setup you
   will see it sitting there with a big circle spinning seemingly
   forever in the top bar.  If that happens, don't panic -- just tap
   the "sync" icon next to it (the two half-circle arrows that form a
   complete circle by pointing to each other's tails).  Mobile Org
   will sync your files down and present you with various views,
   including an Agenda View option at the top that is probably what
   you want first.

8. Use your org files on the road.  You can even modify or add new
   items from your Android device.

   From time to time you should sync with the server, and before
   leaving your mobile device and going back to Emacs, make sure to
   sync one last time so all your changes are saved.

9. In emacs, run 'M-x org-mobile-pull' to pull changes from the cloud.