Add an iCal feed to your site for the Events Manager plugin
You can subscribe to an iCalendar or two iCalendars and display them on your page
TweetScribe plugin connects your WordPress blog with TweetScribe.me
This plugin will add subscription buttons to allow users to subscribe to your RSS Feed and allows you to track your rss feed usage on Feedage.com
Allows visitors to quickly subscribe to your blog using only an email address
RSS link for this tag.