ASLR - another appln of Randomization in Security

Just read that the upcoming OSX Leopard is using ASLR (Address Space Layout Randomization) to defend against malwares. Using ASLR, Leopard would allocate memory for critical operations in a random way so that malwares would fail in accessing memory area where OS related critical code gets executed. It is interesting to see another application of Randomization in Security. If you would want to read more about Randomization, you might want to check out this book.