When did you last check your website?
Today, I wanted to post to DIGG, but they use an image to verify I am human, but the image would not load. Their "report a bug" also has an image that would not load. So I could not post a great link or report a problem.
Do you have somebody checking out your links and website as a typical user? Visitors and customers only give you 20 seconds to interest them or they leave. All that effort, it only takes one small error to lose your visitors and customers.