but multimarkdown would be better.
and local storage is ok.
but the cloud (e.g., dropbox) would be better.
and this space is starting to get crowded, so you need to do something special to stand out.
but you've made a good start.
-bowerbird
the best standalone offline tool is multimarkdown composer. for versatility, visit marked2app.com for an app that gives on-the-fly display of a markdown file as you edit it with any other text-editor, a mighty clever idea, well-executed.
even if you stick with your own tool, you will get lots of ideas for functionality by examining these other executions.
-bowerbird