We are constantly working on and releasing new material. We generally also make periodic announcements on new courses to let you know what is now available.
You can also sign up for notifications on courses you are interested in by going to our course page and clicking on any category, then click on the 'Notify me when new courses are available' button. This lets you enter the topic/subject you are interested in and sign up for notifications on when it will be available. It also helps us track interest in different subjects so we know what you'd like us to come out with next!
You can also email support@LinuxAcademy.com with questions or suggestions!