If you use Twitter, I recommend following @CydiaRepos. It's a bot from CydiaUpdates.net that tweets when a new package has been updated on the stock repos. You can also check the site as it simply just emulates you pressing the "Refresh" button in Changes over and over and over again continuously but without you actually having to do it yourself. Plus you can view the Cydia description pages on the site if for some reason it's not loading on your device, and you can also download the .deb for free packages for backup purposes.