I enjoy the things that others have mentioned, but the things I value most are the first-hand reports:
-I tried this, this was the result
-I shot one of these, it was like...
-I got my XXX license, took a lot of work...
-I had this problem, that fixed it up...
Its just a lot of virtual experience.
Also, the "find" button is a virtual encyclopedia.
And I like the "what would you do" exercises. They make me think.