This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
For iPhone, a good place for tutorials is http://icodeblog.com. Also, you can go through the iPhone Application Programming guide and other API reference from developer.apple.com.
Also, you can google to find lots of good tutorials for Objective C.