I thought these were pretty interesting, and I had never heard of most of these. Sorry I can only paste the link, the way the article is done I'm not sure how to copy & paste the context. Definitely worth reading though. Makes me want to google some of these cases....

http://www.kcra.com/national/20045956

Also, this could be a good start of a thread where anyone can post other stories of people who have been missing for years and then found alive. Post away!!