It looks like Adobe withdrew the PDF with the file format specifications for Photoshop 6.0.
In order to get the Photoshop 7.0 SDK, one needs to be a member of the Adobe Solution Network.
Just went online and saw that as well - VERY interesting...
You also et a copy of the Photoshop SDK with every copy of Photoshop - it's on the CD (or at least used to be).
The 6.0 specs seem to indicate that the file format changes slowly, so reverse engineering the formats should work in most cases.
The changes between 6 & 7 were minor at best - nothing significant that should effect GIMP. There are still many things that the GIMP has to support in the 4 and 5 formats, let alone 6 and 7.
Leonard -- --------------------------------------------------------------------------- Leonard Rosenthol <mailto:leonardr@xxxxxxxxxxxxx> <http://www.lazerware.com>