Dan and Marco discuss the new 5by5 Radio app, why Apple may not want to add paid upgrades to the App Store, the infinite market for podcast clients and to-do apps, Instacast's in-app-purchase backlash, how and why to remove features from an app, the new 15" MacBook Pro rumors, Thunderbolt's likely overshadowing by USB 3, and near-future concerns for a Retina laptop.