GTD Works, Thanks for the great response... makes a ton of sense. I too would love to see something for Mac that unifies it all - why can't Apple create something between iCal, Mail, and Contacts? I hadn't heard about Outlook for Mac, so that will be interesting.
I do love Omnifocus - not sure why working in it always ends up making me go numb to my lists. I've been keeping the running context lists in my Filofax (all else on the Mac/iPhone) and while I don't like lugging the thing around, I do like highlighting what gets done, and also capturing new actions right there without having to transfer them to digital later.
I also think that if the lists are on paper, projects and project support material can be stored in Evernote, which syncs well with iPhone.