Google Earth now has the Rumsey Historical Maps available as a layer. These can be found in the Featured Content, but are only accessible if you are using the new Google Earth version 4 (released 01-Nov-2006).
I have just been playing with the ‘Australia Southeast 1844′ map.
Rumsey Historical Maps – This is a collection of historical maps which you can overlay over their location on Earth. If you are not running Google Earth 4, you will not see this layer. Open the folder and turn on the map that interests you. The first link shows you the locations of the different map and each description gives you a few details. You can then turn on each map and they will be overlayed in GE. The maps are “regionated” which means they will load more detail as you get closer (it also means the images are scanned at a very high resolution). I’m sure some of my mapping friends like Jonathan Crowe will be curious to see these.
Catch you later, I’m off to play with the ‘World Globe 1790″ layer 
LINKS:
[1.] Four New Featured Google Earth Layers
[2.] David Rumsey Collection of Historical Maps available in Google Earth
[3.] Old world meets new on Google Earth
Hi All Experts,
Does anyone use google earth images as ground image planes for use in aerial scenes. I know how to stitch them together but are there any tools or tricks to make sure that the images are at the same height, angle and such to make sure they stitch well. I know in the pro version you can get bigger images but im not going to pay for the pro version when i could stitch multiple images together…