Just updating the link to the archive of this article:http://www.theatlantic.com/technology/archive/2008/05/bright-side-5-interesting-gtd-software-including-for-mac/8013/
An endorsement from Fallows isn't trivial -- he mentions his favorite information management software ('Zoot'), but doesn't mention that his endorsement of that software has kept it alive for many years. Zoot's developer built a very good application (it's not
GTD, BTW) but baked so much arcane complexity into it, while neglecting the interface, that it almost died for his inability to update & modernize it.
I would find it hard to make a "trusted" system out of something called MonkeyGTD. Apparently that developer saw the light, and changed the name to mGTD.
As for OmniFocus, it is a gold standard of sorts for GTD simplicity, but next to ThinkingRock, suffers for being single-platform (Mac only) and its inability to run from a thumb drive on more than one computer.
Thanks for sharing this article -- even two years later, I enjoyed it!