In the Talkback section of my earlier post on XP versus Vista adoption (Who's choosing XP over Vista?), several commenters pointed to a PC World Techlog post by editor Harry McCracken that they believe contradicts my conclusions. Here's what Harry had to say: On January 30th, Microsoft released Windows Vista to consumers, who have been adopting it in ever-growing numbers. But those numbers have been creeping along rather than rocketing: As of now, Vista ... is used by 14 percent of visitors, while 71 percent use Windows XP... How much of an accomplishment is it for a new version of Windows to get to 14 percent usage in 11 months? The logical benchmark is to compare it to the first...