RIM have announced that they are now offering the BlackBerry Push Service to all BlackBerry developers. This news seems strange in that I thought the Push APIs were already available, but apparently they are now fully public.
The BlackBerry Push Service has two options: BlackBerry Push Essentials and BlackBerry Push Plus. BlackBerry Push Essentials is a free service that developers can incorporate into their applications and allows them to push content to their customers immediately. BlackBerry Push Plus has a free and paid tier that provides developers with notification that their push has been delivered. If a content provider needs to get information to someone, they can tell if the target device has received the push.