Some people mess up when they design a website because they end up with frustrated visitors. I've talked about a few things they need to watch out for if they want to keep their visitors happy.
When you design your website it's important that you don't rush into anything too quickly. You don't want people to click away and never come back. If you want everyone to enjoy spending time on your site it's really important that you don't annoy them. You know how much patience an average visitor has these days and it's easy to scare them away.