It is the advent of the storage players into eDiscovery that might finally ease the way for IT and the lawyers and compliance officers to understand each other. Because IT is comfortable with the storage vendors, multi-vendor sales teams can relate to all three stakeholders in a way that pure eDiscovery players rarely do.
The lawyers have always needed IT, if nothing else than to search backup tapes and possibly de-dupe the data sets for review. But with eDiscovery changing so quickly, Legal needs IT -- even if neither of them knows it yet.
At a minimum, the corporation needs to have eDiscovery-related software tools in place for a) automatically discovering potentially relevant documents across a wide variety of search terms and metadata and b) a way of holding relevant data where it cannot be deleted or modified until the hold is lifted. These procedures may be minimal, but they are foundational to legally defensible and cost-effective eDiscovery. These tools require both IT and Legal involvement: Legal is responsible for inputting the searches and establishing hold parameters, while IT is responsible for deploying the collection and hold applications across multiple networks and storage targets.
Beyond this minimum technology deployment, here is what I see as basic best practices for corporate eDiscovery: