This plugin makes it super easy to send push notifications to people who subscribe to your WordPress blog using Pronto Push.
Open .zip file under the WordPress install window. Activate the plugin, then go to the Settings page under "Pronto Push".
You MUST have a Pronto Push account with a developer channel setup beforehand, http://prontopush.com/Developers
It will ask you for your channel ID and push key which can be found on the developer page.