I like MacWorld's reviews and articles. And their new app, called App Gems, looks to be really useful. Each weekday this app highlights and App Gem of the day — an app that's highly recommended by their staff of experts. Plus, the app also includes Essential Collections of great apps, which are handpicked by the editors and writers at MacWorld. You can also see lists of top-rated apps by category. And finally, App Gems includes news stories, blog posts, and tips posted on Macworld.com. The app is $1.99.