No Particular order but these blogs are worth following

http://www.raywenderlich.com/

http://www.cocoanetics.com/

http://maniacdev.com/

http://furbo.org/

http://iphonedevelopment.blogspot.com/

http://idevblogaday.com/

http://cocoawithlove.com/

http://idevrecipes.com/

Im sure I have missed loads of really good ones, so looking forward to discovering some more via this ask!