Lockhart's Lament was discussed here earlier this year: http://giftedissues.davidsongifted.org/BB/ubbthreads.php/topics/72250/1.html

I just saw that he has now published a book of the same title:
http://www.amazon.com/Mathematicians-Lament-School-Fascinating-Imaginative/dp/1934137170

For anyone that has read the new book: is there new content? It's 140 pages vs. the 25 page PDF, but in the first few pages on the Quick Look, it appears to be the same text in bigger font on smaller pages.

If he has expanded the text, I would certainly buy a copy!