Memory management is important on any platform. Here are a few Flex specific questions:
Is there a delete operator in ActionScript?
Yes, there is, but it removes values from collections, it doesn't release memory. Only the garbage collector is able to release memory.
How to prevent memory leaks?
Null-ify members to make the garbage collector release them; addEventListener adds references to the object, so each addEventListener should have a corresponding removeEventListener.
Explain weak references.
