Sorry to post this here- but I don't have the time to register at satollo.net to access the forums.
I like your plugin, and think it has great potential- especially allowing unlimited subscribers/newsletters for all users.
One major thing I want to see is pictures/screenshots. (Sorry if this has been said before). Let's see the plugin in action! Here are some things I look for:
-What does it look like?
-Is it easy to use?
-Menus / preferences?
*Header image: One of the main features that sets this plugin apart is unlimited subscribers/newsletters. Use this to your advantage and include it in the header!
Anyway, You have a great plugin- I can't wait to see it grow!