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Memory (and resource) leaks happen. How do you make sure they don't?
What tips & techniques would you suggest to help avoid creating memory leaks in first place?
Once you have an application that is leaking how do you track down the source of leaks?
(Oh and please avoid the "just use GC" answer. Until the iPhone supports GC this isn't a valid answer, and even then - it is possible to leak resources and memory on GC)