Check out Material Design (pdf), a new look & feel for creating clean, fluid apps:

It’s nice to see these developments drawing a favorable response:

• “By far my favorite thing announced at I/O today…” — John Gruber
• “Google’s transition from a company that used to think about design the same way as it thought about human resources—as a cost of doing business—to a company that prioritizes design is remarkable, at least insofar as its products look and feel and work so much better today than they used to.” — Khoi Vinh