Firstly, Looking forward to release of 2nd edition. The draft is very readable. I consider myself a novice in this area and was very comfortable with flow and ordering of the material. A minor observation: If not sitting at a terminal with access to ::help <cmd> it might be beneficial to footnote the module supporting the <cmd> e.g. "::ps" with footnote at bottom of example/figure (genunix).
Probably not related to internals...but I find myself confused by 'umem' and 'kmem' commands/modules. This message posted from opensolaris.org