Until somebody writes the official specs for the Amazon ad, here's what they have on the WoW website that comes with the collectors edition.
# The full game on both CD-ROM and DVD-ROM
# 1-month subscription to World of Warcraft
# The Art of World of Warcraft, 200+ page hardcover art book
# World of Warcraft Behind-the-Scenes DVD
# Exclusive in-game pet
# Official soundtrack
# Cloth map charting the continents of Kalimdor, Azeroth, Khaz Modan, and Lordaeron
# Signed Collector's Edition game manual
# 10-Day Free Guest Pass - invite one of your friends to join the epic quest
The list is amazing all the extra stuff you get. A 200 page hard cover book, and the sound track easily are worth the extra $30. But they go on with 2 versions of the game in both CD's and DVDs. Plus, the ability to give a friend a trial version and the DVD of behind the scenes. If they are still available, I recommend buying this version over the regular if you really love the Warcraft series. It may be a risk to wait and see when the actual release date is, but they are nearing Open Beta, and my only guess is before Christmas.