More US Open/gadget combo posts. Here's a new HP ad by Serena Williams. Fact: I recently discovered that these commercials were made on HP workstations at the Goodby Silverstein agency in SF, not Macs as I'd assumed all ad agencies do. This comes by way of an HP exec, but only the people at Goodby know for sure. Great ad, either way, especially when Serena tosses the competition away like a little gnat.