The most interesting 'urban infrastructure' development I've seen recently is iPavement; a Spanish company who are building wifi into pavement slabs. Not only will the pavement slabs wifi hotspots provide wifi access, but the set-up comes with 'ready to go' apps, which the council or service provider can configure to provide useful features to passing pedestrians. For instance mucis, library books and coupons can be pushed to users in a localised way - think 'Our city, Our Music' or 'Our City, Our Literature' and you get access to complementary titles by local artists as you wander through San Sebastian. Coupon Offers from local shops are available in the coupon booklet-app. iPavement also has a briliant feature available via bluetooh - so the pavement on a specific street afflicted with icy footpaths can warn pedestrians to mind their step.