Some of the forums I have found contribute greatly to my knowledge of the system. With a good forum chances are that no matter what your question is someone has done it before and is ready to tell you all about. Online subscriptions are fun and easy. I really love being apart of them.
What's really great is that most of these subscription sites offer offline subscriptions as well. This means I can use them to find new magazines and publications, some of which I never knew existed. Finding all of this in one spot saves me time and money. It is pretty great.
It is certainly a lot easier to go to a specific subscription site to find Linux fans than to wade through Google indexes for them.