With the proliferation of books, online articles, instant downloads, podcasts, video on demand and even preachers on Australian TV, there is now more information available to the Christian than ever before.
You can discover what Jesus ate and alter your diet accordingly. You can discover who 'real men' are, and what happens when women pray.
I can learn from Swindoll, Compolo, Bell, Mark Driscoll, Deere and whoever else I wish just by logging on.
Yet there is something which for me is still irreplacable, and that is the human face of discipleship.
Jesus could have written a book and outlined a strategy to His disciples. Yet as far as we know, He never wrote a book.
Instead He said, "come follow me". He wanted His disciples to live with Him, be a part of His life, learn from His vulnerabilities and triumphs.
For me personally, that practice of being able to follow, to learn, to be close to another Pastor who has walked or is walking a similar path is invaluable.

However lately I have been losing some mentors, guys I can learn from, and it sucks.
One of them went off to sell real estate, and he was someone who I genuinly could ask advice from, and know it was sound. Not necesarily life skills, but know how stuff. He knew how to get things done, and he knows what people are like. There is no doubt he will be a very succesful real estate agent. But it sucks for me, because I need guys like him in my life. And there is something very unique about being a Pastor, there are not many professions like it, if any.

As much as books and conferences are great, I learn best from sitting down with someone and picking their brain, hearing real stories.