On this week's all-star episode: Author and columnist Kirk McElhearn, Macworld's "iTunes Guy," talks about the growing popularity of streaming TV, mentions some of his favorite shows, and speculates on what constitutes a new product category for Apple. IT specialist Dave Charbonneau, president of CMIT Solutions, discusses Microsoft's dilemma in convincing users to give up Windows XP, and offers some common sense tips on preparing to upgrade — or replace — a PC. Outspoken commentator Jim Dalrymple, Editor in Chief of The Loop, talks about the ideal screen sizes for the next iPhone, Facebook's expensive acquisition of WhatsApp, an instant messaging app with hundreds of millions of users, and what new product categories Apple might enter this year.