Mac OS X only: Free menu bar application Facebook Notifications brings notifications and status updates from the popular social networking site to your desktop.
After you install and enter in your Facebook credentials, just click on the Facebook Notifications icon for a quick look at your most recent notifications and messages along with quick links to take you straight to your news feed, profile page, or a new message composition window. You can even update your Facebook status at any time via a simple keyboard shortcut (Cmd+Alt+Ctrl+Space by default).
Facebook Notifications also integrates with Growl, so any time you get a new update on the site, you’ll also get a new Growl notification—particularly handy if you’ve set up Growl with Prowl to get push notifications to your iPhone for any Growl notification (something that Facebook on the iPhone doesn’t yet support).
We could debate the merits of Facebook as a productivity tool, but considering how many people use Facebook as their main hub of communications these days, I think it’s a foregone conclusion at this point. An application like Facebook Notifications is a great tool for staying on top of what’s going on with your Facebook friends.
Facebook Notifications is freeware, Mac only, and despite the Facebook URL, it is not developed by Facebook.