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Summary: The oldies continue to be goodies -- or rather, baddies -- in the list of design stupidities that irked users the most in 2005. For this year's list of worst design mistakes, I decided to try something new: I asked readers of my newsletter to nominate the usability problems they found the most irritating. I assumed that asking for reader input would highlight many issues that I hadn't noticed in my own user testing. This was not the case. Instead, all of the top thirty problems were covered in existing usability guidelines.

