"Top ten mistakes of Web design" and others

today i've found very interesting ariticle: Top ten mistakes of Web desing and very useful site:
useit.com: Jakob Nielsen's Website
who is Jakob Nielsen i don't have to write or if you don't know him you can read about him in wikipedia. he is one of titans of usability of gui (desktop programs, web pages and other) and his site contains many useful articles and links about usability.
i think that everybody who desing and make user interface should dig this site up.