It is difficult to find some boards. Some users don't know they need to filter by a particular product area in order to see certain boards. Example: You need to check the "Documents & PDF" filter in order to see the Document Cloud PDF Services, Type & Typography, and Acrobat Reader Mobile boards. The main filter options (Popular, Alphabetical, Latest) don't show all boards and interact with the fitlers as well. Also, some boards are only discoverable when searching for them, Community Help for example.
There should be an easier way to access the master list of all boards without filtering or searching on the forum landing page.