I've been developing my "math eyes" for a few years now, but it really started to come together for me pedagogically at last spring's OAME conference, where I had a chance to hear Dan Myer and various other math educators talking about how best to engage students in the 21 Century.
Here's one to get you started... stay tuned for more, or feel free to contribute your own by contacting me, or by leaving a comment below.