I'm the author of Howl (http://howlapp.com http://howlapp.com), another alternative for general push notifications. Howl supports notification icons, stores no

I'm the author of Howl (http://howlapp.com http://howlapp.com), another alternative for general push notifications. Howl supports notification icons, stores notifications locally for offline viewing, and is a universal app. There is an official Growl plugin, and API for integration elsewhere.