I am delighted to see my website on usability engineering included in Guy Kawasaki’s AllTop user interface section along with a lot of authorities on user experience.

A little analogy on usability issues that might be low in severity but high in frequency: About the small usability issues that you think you can ignore, think of them in this way- one small crease on an ironed shirt is okay. But creases all over and you have an un-ironed shirt.