I've got Beyond Backpacking.
An interesting read about ultra lightweight backpacking. Ray has lots of experience in this area but gets just a bit too extreme for me at some points. It's great to know what is possible though so that you can then make your own choices.
I particularly like the idea that if you carry less, you travel faster and further in a day. This means you take less time and so need less kit, which means you travel faster. You see where this is going...
If you take NO kit you should be able to travel anywhere instantaneously...
Stu