From the PDF introduction
The Ghostwalk Campaign Option was released only a short time before the D&D v3.5 rules were. This document provides all the changes that should be made to the book to update it for use with the new rules. A few clarifications are included here as well.
Minor or obvious changes that a reasonable person could determine without effort, or which have no effect on the game mechanics of the book, have been omitted unless entire sections are being replaced. Such changes include the following.
> The number of 5-foot squares corresponding to a creature’s
speed,
> A separate attack entry for any monster that has only
one attack form, or whose full attack is identical to its
normal attack,
> Changing "Face/Reach" to "Space/Reach" in cases
where the corresponding numbers remain the same,
> Changing a spell’s casting time from "1 action" to "1
standard action,"
> Changing a magic item’s "Market Price" to "Price," and
so forth. Changes such as these are left in the reader’s
hands. All other pertinent adjustments, however, are
given here.
Also included with this document is a map that was dropped from the book for space reasons. With this bonus map and the changes indicated here, your Ghostwalk campaign can be better than ever before. So get out your pen and start marking these changes in your book!