Missing Helvetica fonts in Pages, Numbers and Keynote
The problem stems from iWork '08's apparent inability to find the right Helvetica font when other versions of Helvetica or Helvetica Neue have been added to Fontbook, an application which you'll find in the Applications folder.
The problem is solved by inserting the OSX install disc into the computer. Open the disc by double clicking its icon and in the window scroll down to a folder called System. Double click to open and double click Library. Select and open a folder in there called Fonts.
From your Applications folder, open Fontbook and delete any Helvetica and Helvetica Neue fonts. To do this, find and select the fonts under the User collection and then select File > Remove fonts.
This puts the confusing fonts in the trash.
Now, from the Fonts folder on the CD, drag any fonts called Helvetica into the All Fonts part of Fontbook (in fact, you can just drag all of them over - it shouldn't be a problem).
Once these have copied over, you should now find that Pages etc open without a problem.
A possible downside to this is that it may affect design software that uses a wider range of Helvetica fonts than those found on the OSX install disc. If such a situation arises, it seems that the only choice at present is to stop using iWork and revert to Office...
Hopefully, Apple will come up with a fix for this bug...
Mac Pro 2 x 2.66 GHz Dual Core Intel Xeon, Mac OS X (10.4.10), 5 GB Ram