Public key encryption and digital signatures for email are going to become far more important as time goes on. Signed email for big companies (that is, producing a cryptographic verification of the contents that could only come from the alleged sender) will serve to enhance trust. When email programs prioritise signed messages from trusted public keys and discard or downplay untrusted or unsigned messages, that trust is even easier to foster. It does start to create the problem of maintaining private repositories of trusted public keys and what to do about distributing false public keys, though.
Mokalus of Borg
PS - It's not a perfect system.
PPS - And it may end up being too complicated for general use.
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