Here are 5 of my favorite iOS development blogs

raywenderlich.com

Without doubt this blog features the widest range of iPhone tutorials I’ve seen.  They are explained simply but in great detail and there is a particular focus on game development.

Maniacdev.com

For more advanced developers, this blog offers lots of new tricks and tips to enhance your development skills

iphonedevelopment.blogspot.co.uk

Written by veteran coder Jeff Lamarche, this blog isn’t updated as regularly as the others but is worth following for the occasional brilliant insight.

mobileorchard.com

This is a well established site covering mobile development in general.  A good source for the latest development news

iosdeveloperguide.com

Sorry, I couldn’t resist….

Can you recommend any others?