Threadless When entering the website, a message in the top bar will appear that the company is able to ship to the country you’re currently in.
Threadless - Knows whats in your shopping cart and sends an email to notify that some of the cart’s products are running out of stock.
Quora - Displays a little “Trying to regain internet connection …” notification if the internet connection is lost.
Chrome - Notification bar overlaps with the browser UI, that way it can be distinguished from fake bars.
Windows 7 - Notifications don’t fade away if you don’t touch your mouse / keyboard. If the user is away from keyboard he will see the notification when he comes back.
Cloudapp - Drag and drop file to menu bar, loading icon, growl notification