4 Keys to Hearing God's Voice Free Video Series (Overview Mp3 - free streaming 62-min audio - recommended) - Here is a free video series and an overview audio, from Mark Virkler, on 4 Keys to Hearing God. I highly recommend this training because it is very practical, insightful, and honors Scripture.
Overcoming Blocks and Hindrances to Hearing God's Voice (Printable PDF from Mark Virkler)
I will take my stand at my watchpost and station myself on the tower, and look out to see what he will say to me, and what I will answer concerning my complaint. And the Lord answered me: "Write the vision; make it plain on tablets, so he may run who reads it." - Habakkuk 2:1-2 ESV