With rare exceptions, generic chain letters are all essentially the same. This is communication at its basest form.
David Rhodes wants you to earn money
And he has set up a flimsy cash-shuffle via e- and snail-mail. My tip: NEVER send money as part of any chain letter. (I've deleted the names and addresses to disable this example.) The U.S. Post Office has a few words about letters like this one. If you're trying to do the math, check out another web site that details the pitfalls of chain letter pyramid schemes.
Six Degrees of Separation
This one apparently started on 10/31/96 - The theory is an old one: Everyone in the world is only six degrees away from everyone else. Somehow, this e-mail is supposed to prove this true. For space reasons, I've only included the first 50 names.
The Sociology Project
Is this an actual experiment or a hoax designed to flood MJLenner's e-mail box with garbage forwards? We may never know.