Graphic files of work already committed - including general operating systems, and specialized diagrams of linux families
OS tree GIF (Part I)
OS tree GIF (Part II)
OS tree PDF (Part I)
OS tree PDF (Part II)
VMS Family Tree
Debian based Linux History (JPG)
KNOPPIX based Linux History (JPG)
LFS based Linux History (JPG)
RedHat based Linux History (JPG)
Slackware based Linux History (JPG)
Originals Linux History (JPG)
SuSE based Linux History (JPG)
Not my work, but very informative none the less
Non-UNIX OS history by Paddy (his website seems to no longer be maintained)
All roads lead to Symbian graphic