Good writeup! Evernote is great for GTD.

One of the interesting things I’ve found is how many different ways it can be implemented.

I like how you’ve implemented the tickler system using the tags, its very true to the original idea from David Allen. I just find that it’s easier to drop anything date related into my Google calendar. The downside being that you end up using two different systems, but I’m in Gcal all the time anyway, so it’s not a huge burden.

One other thing you might try: instead of using an Inbox tag, my inbox consists of any notes that don’t have any tags at all. This way everything captured automatically starts out in the inbox until it’s processed.

I set up a Saved Search to identify any untagged notes and that represents my inbox. You can read more about exactly how to do this here:

http://examinehealth.com/personal-productivity/69-gtd-and-evernote.html