The terra has the advantage over yahoo in the topo maps, which yahoo does not even have. But just wanted to post some pics as far as quality and age of pics go. I think the free terraserver that is hosted by microsoft are old pics that terraserver.com sold off and that is why they are free. The first pic is the free terraserver which is out of date for my area, maybe some areas it is newer. The second pic is from terraserver.com in which you have to subscribe to get the real close zoom in. and the third pic is the yahoo free pics. Hope this helps people find some good areas!