Many lawyers are still unaware of some of the basic steps behind the procurement of digital evidence. In many ways, the basics are not too different from typical civil discovery -- it's just that the medium is different (and more impermanent).
Here are some tactical considerations you should keep in mind next time you want to get your hands on your opponent's evidence. And remember, discoverable evidence is a much bigger set than admissible evidence. Make it a part of your pretrial discovery strategy to go for the jugular.