Ross Anderson several very well written papers on security.
The emphasis is on what it takes to make real systems secure.
Brad Cox has
interesting ideas about charging for use of software rather than ownership,
in order to provide better incentives for good foundational software.
Economists
Robin Hanson
who generates ideas for new social systems and ways for groups to make
decisions. Here's his list of
people and their contact
points. It's a pretty exhaustive list of interesting people on the
net.