If you always use the same two apps in the same space (e.g., Reeder/Tweetbot for me), save dock space by only putting one in the dock. Tapping on that app will always open both apps in that space.
If you always use the same two apps in the same space (e.g., Reeder/Tweetbot for me), save dock space by only putting one in the dock. Tapping on that app will always open both apps in that space.