I doubt that I'm the only GTD nerd who now has faster and more ubiquitous access to the internet than back in 2001, when Getting Things Done was first published. Just as one data point, I work primarily on internet-related projects from home on a 1.5Mb DSL line and house-wide wifi: "@online" is virtually all of the time for me. So, the GTD contexts associated with my work demand more subtlety to be useful (or even worth the bother of maintaining them).Link
Take me and multiply it by an order of magnitude for students with Hiptops, full-time AIM access, and a completely wifi campus with unlimited, lightning-fast bandwidth. I suspect that this desk-free, under-25 crowd are a group worth Davidco devoting some avid attention to.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.