I created an AppleScript droplet for pandoc file conversion. It is available on GitHub here:

https://github.com/nathan-artist/AppleScripts

Any AppleScript wizards who would like to improve it can fork it on GitHub and submit a pull request.

Here is a longer description of the script:

This AppleScript droplet is designed to make and run a shell script that uses pandoc (the "swiss-army knife" for document conversion) to convert one or more files whose icons are dragged onto the droplet icon in the OS X Finder. The script converts multiple input files recursively, instead of concatenating multiple input files as pandoc does when run from the command line. We find this droplet to be much less tedious to use than the command line. To save the script as a droplet, open the script in Script Editor and save the script with file format: Application.