I took a bunch of Davidco podcasts with me on a 12-hour roundtrip the weekend before last (I'm a poor student who can't get Connect, so I gobble up free podcasts in batches and then never, ever delete them), and two were David and Kelly and the CTO whose name I can never remember...Robert? talking about the ideal list manager.
One podcast was them discussing the various merits, and then there was no real resolution (because as I'm sure David knows, the moment he says, "Use this product" GTDers will flock to it in droves, whether it's actually the right product for them or not). And then it sounds like there was some listener backlash/reply that there was no "answer." So there was a second podcast, more of the same. Except, at the end, David said, "You know, the thing is, if you asked me what is the very best, most foolproof list manager? A loose-leaf notebook. Everything is there, you know how to use it" etc.
When I introduce someone to GTD, I always suggest paper to get going. The last thing they need is to learn a new tool along with the thought process. It really also helps underscore the notion that the thought process is independent of the tool...they've used a plain notebook before, so it obviously must be the way they're thinking about it that makes this notebook work differently than some other notebook. And the times I've seriously fallen off the GTD wagon, I always begin again with a paper list manager for at least a while. There's something very concrete about paper that takes the focus off the tool.
Collect. Process. Organize. Review. Do. That really is all there is to it.