There are two versions of the packaging for the CD version of this album. One is the standard CD Jewel Case arrangement. The second is packaged in a cardboard storybook thing, a couple inches wider and taller than the jewel case. At Newbury Comics, the normal version is selling for $11.88 (standard Newbury Comics new release price), while the storybook is $19.99.
I bought the normal version, and was pleased to find some Semi-Hidden Secret Fun! Underneath the black plastic CD holder you'll find a little booklet with the lyrics, done with typically strange Radiohead art and lettering:
IVE LOST MY WAY WASHED OUT TO SEA IM LOST AT SEA
COME BACK TO ME COME BACK TO ME DONT BOTHER ME
I S L I P A W A Y
I SLIPPED ON A LITTLE WHITE LIE
WE'VE GOT HEADS ON STICKS
YOU'VE GOT VENTRILOQUISTS
along with pictures of monkey heads on dinner plates and telephones and so on. Yay!
Sadly it seems that the newer copies of Kid A do not contain the lyrics booklet under the disc holder. Lucky for you, dear reader, the Internet has come to your rescue. Images of the booklet can be found here:
Thanks to thax for the heads-up on the booklet