Professional linkbaiter Guy Kawasaki reports a "juicy tidbit" from the Gnomedex conference in Seattle: "Adobe is scratching their collective chins and in deep thought considering a Yahoo acquisition." We don't believe it. With a $23.61 billion market cap, Adobe isn't exactly in a position to spend $40 billion on Yahoo, even its stock price has finally sunk below where it was when Microsoft made its offer. So why the rumor? Look to its source: Chris Pirillo — the guy who puts on the Gnomedex conference, of which we admit to only a vague awareness before Pirillo sent a Twitter message about the rumor and got everyone talking about it. And him. And his conference.