DCAR (Discovery, Compliance, Archival, and Retention) is a big topic these days. I've done some work with 3Sharp in this space, and I have been fortunate enough to be given the opportunity to write an ebook for Windows IT Pro on the topic.
The first chapter is now available for free download with registration; the remaining chapters will be coming out over the next few months. So if this is something that interests you, feel free to go take a look.