I feel like this is a problem too. You actually got me thinking about this, and since I don't think I do this, how I avoid it.

I don't think I do anymore. I mean, I do less than other people, but I don't go deeper like I used to.

I think the solution, is books. I'm normally a little disdainful of those who have bookcases of technical (read: computer/programming) books, I can get the same or better info on the Internet (certain books excluded, but these books don't take entire bookcases).

But this is because I've progressed far enough in my understanding of this field that I wouldn't benefit particularly much from these books. Which, I think is why my learning in other areas has slowed, I no longer go to the bookstore. That means I don't by chance pick up a book on extra-dimensional physics. Because I don't need a book to help me pick up CodeIgniter or Python. This, of course, implies a tendency I have, to not go shopping, I only go into a store if I know what I'm going to buy.

I think that it is hugely beneficial to just walk through a bookstore, and just pick up a book on a subject that is interesting to you, that you _don't_ know a lot about.