There has been a lot of talk about the problems with people not being able to access the Obamacare website. Thousands of people were not able to sign up due to the servers being overwhelmed.
It's very important for the designer and the client to have a good understanding of the potential numbers of people who will be accessing the website after launch. There should have been a lot more planning and testing before officially launching the website to the public. Here is a video piece by CNN on the troubles.