FYI, here's a link to a blog post by Stafford Betty on John Adams' dying words - a subject that was discussed here recently in a comments thread.
And here's a link to a book released last year, The Last Frontier, by Julia Assante. It covers the evidence for postmortem survival and discusses ways of accessing your own mediumistic talents. I've read only part of it so far, but it seems like a very good overview, well researched and clearly written. It's available in print and ebook editions.