Street Atlas...or saving good maps

I know that there are pretty much no good street atlas software for mac. If there is new software does anyone know what it is?

Or is there another way to use online maps (google, yahoo, etc) for when you are NOT connected to the internet. For example is there a way to capture a town you are viewing when your are online. Then can save it for when you don't have an internet connection. Maybe using google earth?

I know that when I have google maps open and browse thru it that as long as I don't close it, it still works and I can still scroll through when offline. So is there a way I can somehow save that?