This plugin enables subscribable.com users to subscribe to your blog and receive immediate updates each time you publish a new post. It also adds a menu item to the WordPress administration dashboard that you can use to manage your subscribers and a sidepanel widget so that you can display them on your blog. It works with WordPress classic but has not been tested on WordPress MU.
What’s so great about Subscribable? Why not just use RSS?
You can’t build a community using RSS.
Can I customize the Subscribable plugin to fit my own needs?
Of course. Let us know if you need any help!