Up until now, I've been thinking of adding a tagline to my blog, just beside the logo. I thought it would be a great way to introduce new visitors to my site by giving them a small description of it, since my About page is down in the footer. Something along the lines : "Funny videos around the Web", "A directory of wonderful things" or "Simple Productivity".
The reason I want to add a tagline is not for branding purposes, but because I'm afraid new users will feel puzzled if there's not a small description at the top, "What am I supposed to find here?".
However, I've noticed that most sites nowadays do not have a tagline in their design (apart from the one in the meta title). It makes me wonder why. Is it because the users tend to ignore it? The content alone is enough for the users to understand what the blog is about? The usage of space is not worth it?