A very nice free introduction to pointers and memory in C (as well as a very nice introduction to C, both somewhat longer and more detailed than yours) can be found at the Stanford CS Education Library.
I don't know Objective-C at the moment, so I don't know how important it is to get into grittier details earlier, but there you go.
by James — Apr 28
I don't know Objective-C at the moment, so I don't know how important it is to get into grittier details earlier, but there you go.