This is the setup that I have created to make a daemon-client system to work with OS X.
Emacs Client.app will start the daemon if it's not running, will spawn a frame if there isn't an active one, and will bring the emacs frames to the front if any exist. In short, have Emacs (sort of) emulate normal OS X App conventions.
Further, Emacs Client.app can be used as a droplet. Dragging a file onto the icon or selecting Emacs Client.app from the "Open With" menu will open the file and put it in an active frame if there is one.
The basic building block was from Brian McCallister, and can be found here.
This has only been tested on OS X Lion using Emacs For Mac OS X. In particular, the location of Emacs is assumed to be /Applications/Emacs.app/Contents/MacOS/Emacs, and the location of emacsclient is assumed to be /Applications/Emacs.app/Contents/MacOS/bin/emacsclient.
These paths are very easy to change by modifying the set emacs_path
and set emacs_client_path lines.
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Configure Emacs Client.app so that right-clicking a file gives Emacs Client as a default option
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Configure Emacs.app so that it won't appear in the Dock, but still offers a menu bar. The LSUIElement flag takes away both Dock and menu bar.