Originally Posted by SpiralOcean
Interesting... is the Wiki public?
No, it's just an installation of TWiki on my home network, which I happen to have access to from anywhere on the Internet. It contains stuff I don't want other people to see - the Wiki is also my "corporate memory" for want of a better word.
This option won't work for people who don't have constant Internet access (the iPhone on the subway example).
I also use Trac for tasks that are entirely oriented around changes to source code (and any task that contains source code + other work is actually two tasks, break it down). Once a task is recorded in Trac (or any other external task tracking system), the item disappears from the GTD system (it might be referred to by items such as "Document third-party database structure for Trac #356"). Trac includes a wiki system for storing reference material specific to the code base being tracked in Trac.
All I track in iGTD are project names and actions to be taken on those projects - I got lured into storing notes in iGTD a while back and have since regretted it due to the fact that five or six tasks will contain notes of relevance to one client or project, and I end up wasting time searching iGTD for those notes. GTD is a process management paradigm, not a contact management system or a project management methhodology. You wouldn't use a hammer to pull a cork out of a bottle of wine, neither should you use a task tracking system to keep hold of reference material related to a client or project.
TheDave himself says to store all reference material outside your work folders. Check page 36 of the paperback version - the "Workflow Diagram - Organizing" and accompanying text specifically state that if "stuff" you add to your system is non-actionable material that may be of use to you later, move it to your reference filling system
So if someone from OmniGroup is here, please I beg you, don't make it easy for people to attach scads of material to tasks scattered throughout the OmniFocus database. Instead make it really easy to link to multiple external items (just like iGTD does) - this will link to the user's own reference filing system.