ILM - Everything or Nothing?:

Dave from Netapp tries to explain buzzword-du-jour - ILM.

How did ILM get so confused? The basic idea seems straightforward enough: As data ages, its value tends to change and therefore so do the requirements for quality of service. It is important to take this into account when designing data management strategies.

Amusingly, the confusion just happens to be caused by Netapp's largest competitor:

But I believe that the biggest source of confusion is that EMC took the idea of ILM and decided to use it to explain everything that they do. At EMC, everything is about ILM. Go to www.emc.com, and you'll see ILM front and center.