"Inbox 0" is awesome!
I just love a nice clean Outlook Inbox! I may not have the best system in the world (I sometimes leave one or two pressing things in the Inbox until they are done), but I am feeling more and more comfortable with my email flow. As long as I am not totally overwhelmed, usually emails go pretty quickly from Inbox to either 2011 Emails (a reference archive), Time Critical HOLD (due dates in the next few weeks or so), or HOLD. Every once in a while one goes into a Someday/Maybe Outlook folder.
So ideally I am working out of Time Critical HOLD, or on the rare project or action without an email. Of course a problem is I never really get to HOLD, so one flaw is that I am somewhat letting the urgent tyrannize the important. But I do usually at least review HOLD in the weekly review.
So this is my main system, supplemented with just a few text files - a daily log, Next Actions (admittedly seldom consulted, and Projects (same).
So how is your email organization/workflow going?