Wired printed my letter to the editor on the ridiculousness of calling RSS a “push” technology. July 2004 issue (12.07).
Update: I have come up with what I think is a fair definition of “push” :
A) The content provider initiates the transmission
B) In order to do that, the content provider knows
1) That you want the transmission
2) Something about you – at least your address
RSS satisfies neither of these criteria.