[LizPf]

One of the reasons GTD abandoned prioritization is that is often doesn't work.

Say you're meeting someone in a downtown hotel for a working lunch at noon. You hit your subway connections well, your lunch partner called to say she's running late, so you have about 30 minutes waiting time in the hotel lobby. You pull out your laptop, look at your To Do list, and the top priority items are: Office Cleaning, check stationary order for typos, call printer and review design for ad.
None of these can be done while sitting in the hotel lobby.
With a GTD system, you can look at your "laptop-offline" and "phone-mobile" items, and see the tasks you can do there/then, without being reminded of the things you can't do. Maybe they're lower priority, but they still need doing (or you wouldn't bother to list them), and you CAN do them.

--Liz