First of all, thanks for a great plugin!
My issue is that there appears to be some problems with localization/language files in your plugin. I am using the WP plugin Codestyling Localization, and it comes up with this error message:
Compatibility: Loading Issue: Author is using load_textdomain instead of load_plugin_textdomain function. This may break behavior of WordPress, because some filters and actions won't be executed anymore. Please contact the Author about that.
Is this something you could look into?