Famous Web Website Design, Development, & Renovation

I've been quoted in the article 4 Sins of Website Interoperability, part of the excellent Web Design Errors series from Charlotte Website Development. If you'd like to learn about common mistakes to avoid on your own website, this a great rundown.

Last week, Spanish Computer Science student Jago wrote in asking for my opinion to include in an assignment about best practices in web design. I thought he asked some truly excellent questions, so with his permission, I'm publishing his questions, along with my answers, here. Thanks, Jago!

1. If we believe that the thing that can keep people for longer in a website is its design, do you think it would be justifiable to lose in usability and accessibility if it is the only way to get a design that is attractive enough?