Author: Added: 12/29/2008 Duration:188.96 Joost, which Portfolio previously described as going "from superhero from life support," is attempting a comeback, CNET's Caroline McCarthy writes today. Part of its revamping includes its new iPhone application, which I interviewed CEO Mike Volpi about from his London office via Skype earlier this month. I republished the interview here. --Kelsey Blodget, Associate Producer