Tech companies have been flexing their design muscles at the IFA trade show in Berlin this week, trying to prove that Apple’s not the only one that can make ultra-thin, ultra-light laptops and tablets. Turns out that these PC makers can out-slim the iPad and the MacBook Air after all. They just needed Apple to start the fire. Here’s a peek at the best-looking tablets and “Ultrabook” laptops revealed at IFA 2011.