Johann You cannot subscribe to tags yet but you can subscribe to single discussions.
If you want to do that, click the 'Follow' button with the star icon just under the orange 'Reply' button. Then go to your settings and make sure you have ticked when 'Someone posts in a discussion I'm following' under the email column. You will now receive email notifications.
Soon you will also be able to follow us on Facebook where news and updates will be posted as well. ? That may be an alternative in the interim perhaps?