I have been dabbling in writing some programs for the iPad and now i want to try something more. I would like suggestions on some of the finest books that are not very rudimentary but at the same time not advanced either. I have programming experience and help and online manuals do the work for me mostly. But, i would also like to have it in book format so i can peruse through when i am not sitting before the computer. Any ideas? I searched through amazon and the reviews are very conflicting for any given book. My three areas of interest are iOS. Working your way around XCode and Cocoa. I use Microsoft Visual Studio a lot and though Xcode doesnt seem so far fetched, i still like to know things beforehand rather than trying to figure it out.