As told by the Telegraph.
Pretty comprehensive list but this one stuck out at me for several reasons over the last few weeks.
39) Try-hard websites
People do not come to websites for an experience, they come for information. Anything that gets in their way, like slow-loading Flash graphics or counter-intuitive navigation tools, just makes them angry.
I could add any number of other things to the short list on number 39. But to keep it simple, content is king. Deliver quality content in a neatly wrapped package and your users will come back for more.