Check out http://www.raywenderlich.com/. One of the very best tutorial sites out there for mobile app development! Appcoda is nice too, although it's only for iOS.
I don't know if you're an iOS guy but I've been listening to the iPhreaks podcast. There have been a couple pretty enlightening ones.
Also there is great good screencasts for iOS at nsscreencast.com
I subscribe to objc.io, iosdevweekly.com and nshipster.com.
Huh, all ios so far. Maybe me and my coauthors should start and Android developer blog.