Reddit user zackofalltrades for the idea, and Lifehacker for the image!
Unpleasant Design blog, run by Gordan Savicic and Selena Savic, hosts examples of how design can manipulate people and their behavior in public places, by making things they might want to do, well, unpleasant. It's a workable substitute for active enforcement (or fixing the core causes of some of these behaviors), and yields some interesting designs. Seen here are anti-skateboarding metal strips, anti-posting textured pole covers, and anti-bum-napping armrests on benches. There's plenty more on their blog, if you feel like slumming among the less desirable human behaviors!
designed a one-finger zoom: double-tap anywhere on the map, and drag your finger up or down to zoom in or out. Those blue circles and arrows shown in this illustration aren't actually onscreen - as with all gestural interfaces, real estate is at a premium and visual clutter is a no-no, which leads some to call this feature a "secret." But Google appropriately assumes that users will be quick learners - especially when the benefits are so compelling!