yes it is worth picking up even if you own 4.0. Even 4.0 has alot of the same features. so you will be able to follow along.

Book Description
Maya is an essential tool for creating cutting-edge 3D animation and special effects. Today, it's used by everyone from students and advertising firms, to game companies and elite film houses such as Industrial, Light & Magic, Pixar, and Disney.
Written by a top-notch team of Maya professionals, Maya Savvy is a thorough update to the best-selling Mastering Maya 3. It delivers the most comprehensive coverage available for Alias/Wavefront's extraordinarily powerful software. Key topics include: Modeling with NURBs and polygons; creating realistic textures and shading; and working with particles, dynamics, and MEL.

Maya Savvy also features hands-on tutorials that integrate Maya instruction with real-world advice on planning, organizing, and managing your Maya creations. A full-color insert illustrates the techniques discussed in the book. And the enclosed CD adds a 3D gallery plus a collection of demos and plug-ins

Like all Savvy books, Maya Savvy is printed on quality, coated paper for crisp image reproduction.

From the Author
In this newly revised, Alias|Wavefront approved book, we have brought together years of animation and teaching experience to produce a book that will take you from where you are--be it beginner or expert--to a new level of comfort and understanding of Maya.

In addition to its new, high-quality layout and feel, we've included much new material, including a chapter on Maya Unlimited's exciting new Fluids tool, and have placed a copy of Maya Personal Learning Edition (for Mac and Windows) right on... read more