Inbox Good Enough is a brilliant--especially when you're down to those last few emails from strangers, and you only have the energy to respond with, "No, and don't ever email me again." I think this fits in well with Pam Selle's "Go the Fuck Home" philosophy. [http://thewebivore.com/go-the-fuck-home-my-ignite-talk]
Then I’ll delete (not archive, delete) the junk (ie. stuff where the sender didn’t think much about my time).
Isn't that still "Inbox Zero" if you're clearing out anyway? I practice inbox zero but I don't reply to every e-mail that deserves one (though this isn't that often).