Good on-line map source

I was googling for Texas county maps today when I came across this webpage maintained by UT Austin - http://www.lib.utexas.edu/maps/texas.html A lot of what's posted here are very large and detailed.

Look in the left margin menu for links to maps for regions beyond Texas.
(Well, rumour has it that there's something beyond Texas, but I'm a bit sceptical about that. )

Fantastic sight but it may take me weeks to go over all that stuff.

Oh yea, been a favorite of mine for some time now. That and topozone.

Cool. I knew UT had the best map collection, but have yet to see so much of it accessible via the web. Thanks for the link.