If you’re not a member of Bruce Schniere’s CRYPTO-GRAM mailing list I suggest you sign up right now. It’s a wonderful monthly mailing where Bruce talks about everything from security to cryptographyand comments on the latest news.
In the latest CRYPTO-GRAM there’s an interesting story about one of the first well published cases of impersonation, Martin Guerre. Guerre was a 16th century French peasant who was impersonated for 3yrs — the impersonator living with his wife and kids!!!