iOS Development
I have started learning iOS development. And this is really fun.
I found that I do a lot of projects where it would be very nice if I could do the prototype, so I set out to do that.
I found this sources use full:
Memory management:
http://www.cocoadev.com/index.pl?NSZombieEnabled
Ibook Store:
(Free) http://www.stcsig.org/usability/resources/toolkit/toolkit.html
Amazon: