Code errors in “Pro Drupal Development”
For those of you who may be experiencing a few errors when following the examples in the Pro Drupal Development book make sure you visit the book’s website. It has a section with known errors where you contribute you own comments for those not listed.
There’s not many Drupal books out there at the moment, but Lullabot are writing a new one called Practical Drupal with O’Reilly which will be based around Drupal 6.