No surprise here. The Zinio app is free, and the PopSci app is based on the Mag+ demo that we saw a few weeks back.
From the Zinio press release:
Zinio, a global leader in digital publishing technology and services, today announced the availability of its Zinio App for iPad on the App Store. The free app enables readers, publishers and advertisers to embrace a new world of interactive, full-color, multimedia magazines on the revolutionary iPad.
Bonnier Corp.'s Popular Science today launches its Popular Science+ tablet edition to run on Apple's iPad. Available now in the App Store, Popular Science+ is an achievement in digital magazine reading that began months ago in a collaboration between Bonnier's global R&D task force and BERG, a London-based design firm. The resulting platform, called Mag+, is the first step toward a vision of what digital magazine reading can be. (See the video demo at popularscienceplus.com.)