As a designer, I just couldn't bring myself to work with the GTD inbox processing charts in the book and the few I've seen online. So I made my own which I use as my desktop image (wallpaper).
I did a sort of corporate version and bit funkier version, figuring they might spark different attitudes or appeal to different people.
If you like 'em, feel free to use them and share them. Just don't publish them or alter them without my permission. (And David's, no doubt!)
They're not quite perfectly GTD gospel, but they've been working for me. I'd love to hear your comments!
(I can't upload the big ones here since they exceed the file dimension limits, so I'll post a link to the full sized GTD desktop charts.)
I re-posted them individually below. Much better! Scroll down and you can see the images. (Thanks TesTeq!)