Obviously, the key question here is what the desired action on your landing page is. If you're Hanselman, and your goal is to get people to read your blog post

Obviously, the key question here is what the desired action on your landing page is. If you're Hanselman, and your goal is to get people to read your blog posts, then your bounce-rate can be close to 100% and it doesn't really matter-- the content you are attempting to serve up is all on the front page, and additional clicks are secondary. If, on the other hand, you have an e-commerce site like Amazon's, where the landing page is just the first step in a process that you'd like to end in a conversion, then a 78% bounce rate is definitely something to work on.