I've got somewhat of a background in ios development, and i'd like to break into ios design as well, to make my apps look better. What books, blogs and articles do you recommend?
One blog that I follow is iDev Recipes. While not purely a design blog, it shows how to replicate interesting UI elements from nicely designed apps.
http://idevrecipes.com/
It isn't a blog, but I would highly recommend picking up a copy of iOS Recipes by Matt Drance and Paul Warren: http://pragprog.com/titles/cdirec/ios-recipes. It has a bunch of little tips and tricks in it on making your app work and behave better in general.
Also highly recommend their The Complete Friday Q&A; it's a book compiled from their Friday articles that covers advanced topics in Mac OS X and iOS programming.
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!