Salim is on the air...
Salim Ismail (PubSub chairman / co-founder) is blogging, and badly needs some googlejuice for his new blog - "You've Got Ismail!"
He's just posted a mammoth post about the evolution of the internet, and different modes of communication: messaging, request/response and publish/subscribe. I expect he'll have more to say about the third mode in due course :-)