There are new variations. One is from "Jewel Taylor" supposed wife of the deposed Liberian strongman prez, asking for help getting diamonds and gold bars out of the country to ---you guessed it! Nigeria. I liked the line "The lives of myself and my children are at risk ever since my husband engaged himself in this rebel of a thing." Even President Bush gets cited as a party to this, in helping with the Nigerian asylum! I saved it as a true classic.
There's a Phillipine variation, too. That one was amusing in being blatant about help smuggling out our ill-gotten gains embezzled from the government. Refreshingly up-front about it.
There's probably an sociologist somewhere, tracking variants to study. (This is exclusive of the FBI, of course, who have a different interest.)