Marketing Experiments examined how technology can present barriers to conversion.

How To Increase Conversion by Reducing the Technology Barrier

The architecture we use to manage our business may not be the same structure we should use to market it. Our business is to serve our customers, make it easy for them to get what they want, and create an image of class and competence that elicits goodwill.

Read full article: Optimizing Site Design

NetLife Research created an interesting Bad Usability Calendar 2007 showcasing some examples of how not to be usable. There is also a PDF version available to print and hang in your office.