Monotony is a feed reader doing exactly one job: Subscribe to RSS and Atom feeds, Monotony checks for new feed entries every minute while it is running. New entries (not: all feed entries) will be displayed on the desktop as notifications, featuring the headline and a summary (if there's one). To read a news item in your default web browser, just click on the notification.
There is nothing else. Monotony will not show feed entries for the past, i.e. for times when it wasn't running. There is no Google Reader sync, no frontend, no possibility to customize it. Monotony runs as a menubar app or, if you choose, invisible in the background. That's all.
When running on OS X 10.7, you can use Monotony together with Growl, the desktop notification system. However, you don't have to. When running on OS X 10.8, Monotony uses Growl or Mountain Lion's Notification Center to display notifications.
What is new in this release: