Metadata: What You Can't See Can Hurt You
One of most useful features of the Law Librarians Association of Wisconsin (LLAW) Newsletter is Cindy May's Recommended Readings. I can always find a few gems I've missed in her annotated list.
One article of interest is Metadata: What You Can't See Can Hurt You by Sharon Nelson and John Simek. Law Practice 32(2):28-29 (March 2006)
The authors discuss metadata in programs such as Word, WordPerfect, Excel, PowerPoint, and email, and implications for discovery and client relations. They suggest a couple of ways that people can purge unwanted metadata from their documents.