Check out Matt's Mutant Future Page: I discovered this page when looking at my site statistics and checking out where people came to the blog from. Thanks for linking to me, Matt!
I like a lot of the stuff he has up, particularly the maps. The map of the U.S. with California split away from the west coast and the flooding along the east coast into the great lakes is really cool. Another score is his list of additional mutations - you can never have too many mutations, right?
On the topic of Mutant Future links, I realized that I have not shared this random junk generator and random settlement generator (made for Deadlands but eminently usable for Mutant Future) yet. How could I be so remiss? They are a great tool for the improvising Mutant Lord when the players go exploring somewhere that is a blank spot on the Mutant Lord's map.
One more link - Iaian over at the Buccaneers Guild has posted a great tutorial showing how to make quick and dirty isometric perspective multi-level maps suitable for the sorts of buildings likely to be found in the Mutant Future.