The Time Travel Fund: If you put $10 into the Time Travel Fund, they'll invest the money in a trust earning compound interest until the proceeds can be used by future time travelers to retrieve you from the present. Needless to say, I'm extremely skeptical, but I admit that I'll reconsider my views if some of my geeky friends start mysteriously disappearing... (Via Gravity Lens.)

Update from Willem de Moor -- the website is a hoax.