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This is an awesome unobtrusive plugin to help you keep track of all of your theme and plugin updates. Easy to install and configure which is a plus for me. In their own words:
It's important to keep your WordPress sites updated, both for the security of your site and to take advantage of the latest features and improvements of your themes and plugins.
Updates to WordPress core and any plugins or themes installed on your sites can happen pretty frequently. And if you're managing multiple WordPress sites, keeping them all updated can take up a lot of your valuable time.
iThemes Sync is an easy way to manage updates for all your WordPress sites from one place. Instead of logging in to each site individually, you have one place to view and install available updates.