Effective zoom : http://jnul.huji.ac.il/dl/maps/jer/html/gallery5.html (example). "In order to view explanation for specific area of the map, please drag the black rectangle over the desired area in the thumbnail image above, then position the cursor on numbered site or text in the enlarged image." JavaScript code from http://www.24fun.com/downloadcenter/utilmapzoomer/utilmapzoomer2.html
Also applicable:
http://www.24fun.com/downloadcenter/draghole/draghole.html
http://www.24fun.com/downloadcenter/draghole2/draghole2.html
http://www.24fun.com/downloadcenter/bgimgstretch3D/bgimgstretch3D1.html
Zoom showing (red) zoom lines : http://www.sdsu.edu/map/display.cgi?365,153

Evidence that the Process of Constructing a Knowledge Map Helps Learners: http://www.sci.sdsu.edu/CRMSE/Fisher_aaas2000.html

Sample maps from Atlas of Science Literacy : http://www.project2061.org/publications/atlas/sample/toc.htm

(Geo) base Maps of the World : http://www.nationmaster.com/countries.php?b_map=1
Flags : http://www.nationmaster.com/countries.php?b_flag=1

Ancient maps of Jerusalem : http://jnul.huji.ac.il/dl/maps/jer/html/gallery.html

Historic Cities Mapmakers & Artists : http://historic-cities.huji.ac.il/mapmakers/search_mapmaker.html