Mac: If you love saving articles to Instapaper or ReadItLater but don't like using the web site to view them, ReadNow solves that problem by offering a native desktop experience on your Mac. It provides a familiar news reader-esque interface for browsing your saved articles and read them offline in a variety of styles.
Additionally, ReadNow allows you to edit and tag anything you've saved, share it (with multiple services, such as email and Evernote), and check it off. You can alter display options as well, such as increasing or decreasing the font size for optimal reading.
ReadNow is really great if you're not fond of reading through articles in the browser, or if you've become accustomed to reading on your tablet and would like a similarly pleasant experience on your computer. If you want to give ReadNow a try, it is available right now in the Mac App Store for $4.49.
ReadNow ($4) [Mac App Store