Great essay on jealousy (not by me)

In a somewhat less melancholy vein, I found this essay out on the Internet last night, about jealousy. Brilliant stuff.

Update (August 2009): Marianne, the author of this post, has closed up her blog; so the original link (above) won't work. But, out of her extraordinary kindness and generosity, she has allowed me permission to reprint it here.