Rob Pegoraro, the personal technology columnist for the Washington Post, on why the Internet is running out of IP numbers; Avram Piltch, online editorial director for Laptop magazine, profiles the recent Mobile World Congress in Barcelona; The Loop’s Jim Dalrymple discusses the nuts and bolts of Apple’s updated MacBook Pro lineup, and the latest news about Mac OS X Lion.

Cutting-edge commentator Daniel Eran Dilger, of Roughly Drafted Magazine and AppleInsider, explains why he bought a Verizon iPhone and discusses the Microsoft/Nokia mobile platform deal; author and commentator Kirk McElhearn discusses Apple’s new in-app subscription service.

Adam Engst, from TidBITS and Take Control Books, discusses cloud computing, problems with News Corporation’s The Daily interactive newspaper for the iPad, and the Macworld Expo; Bob “Dr. Mac” LeVitus reviews some of the best products featured at the Expo.

Our topic list includes debut of the iPhone on the Verizon Wireless network, the arrival of News Corporation’s The Daily on the iPad, and the Macworld Expo. Guests include columnist Ted Landau, Macworld Senior Editor Dan Frakes, and Peter Cohen, from the “Angry Mac Bastards” radio show and The Loop.