Bugger off! email is still great.

Enterprise 2.0 is the term for the technologies and business practices that liberate the workforce from the constraints of legacy communication and productivity tools like email

Bollocks to you, I say, email is still a great productivity tool. We're just starving it of attention, and innovation, because we can't be bothered solving the problem of spam.

IM is not email 2.0, and it is high time we figured out what email 2.0 should be.