Badges are maybe the most famous design elements of the Web 2.0 design trend.
They are commonly used to emphasize information, sometimes as buttons, in logos, and sure, for the "beta information" of web applications. When used creatively, they are really powerful.
I have collected 36 Web 2.0 badges from the websites which I like the designs of them and hope you will like and inspire.
To use badges on your website check the previous post: Web 2.0 Badges Collection.