I’ve just come across a presentation (in three parts) given by David Rumsey, over a year ago. Worth a view!
“A talk given by David Rumsey at the March 6, 2008 launch of his historical map library and exhibition in the virtual world of Second Life. The talk was delivered at the Rumsey Map Islands in Second Life. All of the maps in the talk can also be seen and downloaded from Rumsey’s free online map library at www.davidrumsey.com”