Other topo map sites

I tried www.MyTopo.com and thought it was pretty good, except that the map display is limited to a portion of the viewing window.

Then I found a list of all the blog posts of people who, like me, are bemoaning the loss of topozone.com. There I found a number of other suggested sites. This one http://mapper.acme.com/ is much more window-filling and looks to become my default replacement for topozone.