When you download a module/widget from the Mendix App Store, this is recorded by Mendix (see the Collectors badge in you Menidx user profile)
It would be nice if Mendix automatically sends you an email, when a new version of a downloaded module/widget is available, so you can update the module/widget in your applications.
As an extra, this could be an opt in/out feature within your profile.
If the widget is on github you can subscribe yourself to a repo.
A subscribe/unsubscribe option per widget would be nice.