Here's a quick best practices tip for GTD practitioners that will save you time. In working with clients of the Gyronix System, I've noticed that many people have saved downloaded items all over their computer. Seriously, take a look at your desktop right now: Filled with crud you don't recognize? Well if it looks like a trailer park after a tornado, live by the following and have that Zen desktop your looking for:
At the top level of My Documents, create an @In-Tray folder. If you've made a list/map of your In-Trays, make sure you add this to the list/map. Save any incoming e-mail attachments, downloaded programs, pictures, etc. into the @In-Tray folder. Then, when you do your Weekly Review, make sure it's one of the buckets you process. Wallah - no more scattered downloads and attachments.