This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
For the elements directlry under the <web-app> there is no specific order as per DD for servlet 2.4. But the sub-elements under the <web-app> elements, i think the order is still specific. As per the Servlet 2.3 the order is specific.