Very nice plugin.
But the instructions on the settings page are very hard to read (small, compressed, illegible). And I had to fight to get there – before the instructions (shortcodes etc.) are showed, I was asked whether I would give my E-Mail address. Not until I answered this "question" the information appeared.
Don't do that. That's simply annoying.
( I choose "No" btw. )
The plugin lacks internationalization, too. I can't change the date format for example. Please put in a .pot file at least.