This is getting blogged everywhere, so why shouldn't I join in. The story at Joi Ito's Web and later published at BoingBoing is fascinating and best explained like this:

"Aoccdrnig to rscheearch at an Elingsh uinervtisy, it deosn't mttaer in waht oredr the ltteers in a wrod are, olny taht the frist and lsat ltteres are at the rghit pcleas. The rset can be a toatl mses and you can sitll raed it wouthit a porbelm. Tihs is bcuseae we do not raed ervey lteter by ilstef, but the wrod as a wlohe."

Being a copy editor, this worries me. Does tihs now mkae me ilerrevant?