The Global Business Network is a network of very smart people who think about the future. The founders are closely associated with the ideas of scenario planning that came out of Shell. If you're a member they send you lots of interesting things to read, as part of their book club. However, they are nice enough to list the books the recommend here. I've read more books off that list than any other. Every now an then I check in and go on an Amazon frenzy.
If you like to read smart books, you should really check it out.