Now that is a palindrome:
A man, a plan, a canoe, pasta, heros, rajahs, a coloratura, maps, snipe, percale, macaroni, a gag, a banana bag, a tan, a tag, a banana bag again (or a camel), a crepe, pins, Spam, a rut, a Rolo, cash, a jar, sore hats, a peon, a canal – Panama!
From Common Lisp, the Language (2nd ed).
And now, this is a geek: http://www.norvig.com/pal2.html and this is a palindrome: http://www.norvig.com/pal1txt.html
Read more at the Google Blog.