"Version 3 works on an iBook!"
http://www.alsoft.com/DiskWarrior/supportdw3.html
"Alsoft still has the DiskWarrior 3.0.3 CD Update available. This free updater allows owners of DiskWarrior 3.0, 3.0.1 or 3.0.2 to create a new startup CD containing the updated DiskWarrior application. To help you determine if you need to order an upgrade to DiskWarrior 4 or download the DiskWarrior 3.0.3 CD Update, please choose the scenario below that applies to you:
If you already own DiskWarrior 3 (your CD is gold and white with the image of the DiskWarrior shield on it) AND...
...your current DiskWarrior CD will not start up your Mac, you will need to upgrade to DiskWarrior 4. Using the DiskWarrior 3.0.3 CD Update will NOT create a CD that will start up your Mac if your current DiskWarrior CD cannot.
...your current DiskWarrior 3 CD will start up your Mac, and you have access to a CD burner, download and use the free DiskWarrior 3.0.3 CD Update. In order to use the DiskWarrior 3.0.3 CD Update, you will need your original DiskWarrior 3.0 or 3.0.1 CD, a Macintosh computer running Mac OS X 10.2.1 or later equipped with a CD burner, a blank CD-R disc, 650 MB of free disk space, and an administrator name and password.
DiskWarrior 3.0.3 CD Update
The DiskWarrior 3.0.3 CD Update is a free updater that will allow you to create a new startup disk with the updated DiskWarrior application on it. If you cannot use the update (i.e. you do not have your original DiskWarrior 3 CD, a Macintosh computer running Mac OS X 10.2.1 or later, or a CD burner, etc.), you will need to purchase an upgrade to DiskWarrior 4.
The updater will not update the version of Mac OS X on your CD. The CD created by the updater will start up the same Mac models as your original DiskWarrior 3.x CD. It will not be able to start up new Mac models that your current CD cannot start up. To learn how to check your CD revision, click here."