Amendments to Federal Rules of Civil Procedure, FRCP, creating opportunities for content management solutions: http://www.byteandswitch.com/document.asp?doc_id=144806&WT.svl=news1_6

Some solutions sit on email, and use keywords and phrases, others enable retrieval from tapes and other media.

At some time in the not so distant future, eDiscovery solutions and ILP solutions will probably merge, as they are both solving much the same problem.