Apple's iTunes Preview Web site has enabled Web-based previews of many titles in the App Store, such as Tap Tap Revenge 2.6, linked here. Aside from making it easier for users to check out apps without having to leave their browsers and launch iTunes, Apple undoubtedly wants to encourage Web search engines to link into the App Store. Given that, it's not surprising that the iTunes Preview site still pushes you to iTunes whenever it gets the chance. Finally, an odd - but likely temporary - problem is that not all apps appear to have Web previews, including Apple's own MobileMe iDisk App. follow link
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Apple Enables Web-Based App Store Previews