Dada Photomontage and net.art Sitemaps h ttp://faculty.washington.edu/dillon/rhethtml/dadamaps/dadamaps2b.html#figcite11
has great ideas for Fibonicci implementation.

Idea to use stylized (and rotated 90'CW) italic "G" in GreatMap logo.

Mapping Your Site (2002 article) at http://www.pcmag.com/article2/0,4149,2992,00.asp

Macmaps.com internet index of Geography, Geographic Information Systems (GIS) and Mapping sites on the internet; http://www.index-site.com/gis2.php

C:\InetPub\Navigation\Sitemaps\Sitegifs2\TreeMap.jpg has lots of good visualization examples related to sitemapping.