Reader Notifier aims to supplement the official Mac Notifier menubar plugins for OS X, in adding support for Google Reader. Reader Notifier tells you when you have new unread rss/feed items available, and lets you visit those feeds without ever going to the Google Reader interface.

In addition, Reader Notifier will tell Google that you've already read the items you've accessed through the menubar, so that they won't bother you as unread when you actually go to Google Reader (for instance at work where you cannot bring your Mac).