Currently listening to J D Greear on tongues & Prophecy. We've all listened a thousand sermons on this issue and read a lot of books and/or blog posts concerning it, so i'm not really recommending it (although it is worth listening). I'm just saying it's what is currently in my ears.
"If you find me short in things, impute that to my love of brevity. If you find me besides the truth in anything, impute that to my infirmity. But if you find anything here that serves to your furtherance and joy of the faith, impute that to the mercy of God bestowed on you and me."