The thing that interests me most about Square is that it feels like a hardware bridge to something else. Hard to believe we're going to need to "swipe" physical magnetic strips for much longer.
Paul Balcerak reverses the information stream, and instead of asking readers for photos, or feeding them unfiltered breaking news, he asks them a simple question: What do you need to know right now?
If you're looking to wrap your head around the concept of 'linked data' on the Web, this list by Martin Moore is a good starting point. Follow the links, and you'll find a few different explainer threads.