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The neat thing about memory map is that it can build a 3D image from the aerial mapping using the elevation data from Landranger map
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That's what Keyhole does too, IIRC.
Yes, it does. It's pretty nifty. We're in the hills, and there's a very distinctive mountain range nearby, so it's fun to change the angle and see if you can make the mountain range look like our view...
The keyhole pro software is very neat... I don't know if the lite version does this, but I got the 7-day trial on the Pro software, and it lets me do line measurements and lot area calculations.
My wife and I had always been a bit unclear on our exact property corners, so we dug out all our county lot plans and such, and I was able to draw a nifty little outline of our lot, and it calctulated the acreage for us automatically and everything quite cool. Even prints out very clearly in color on the inkjet printer. So now in addition to the plot plans in our folder, we've now got satellite photos showing our property and house. Fun. 
Of course, it pointed out that the measurements made by the surveyors over the years are quite iffy, and that our lot's acreage is a different amount depending on which surveyor you believe...