Top Ten Mistakes in Web Design

See this: http://www.useit.com/alertbox/9605.html

There is a website listed the top ten mistakes in web design. You may take a look from there when you are developing a website. And There are few pointers we should pay attention. Because whey maybe the web development trends in the future.
1. Bad Search.
That is SEO. what we are going to learn.
2. PDF Files for Online Reading
I think only few lazy people will do that. How can you use the PDF file for content?!
3. Not Changing the Color of Visited Links
Pages are always be updated. So, don't change the color, don't remind visitors don't click that link.
4. Non-Scannable Text
Surely, visitor will not read your content word by word. So, show the important things first.
5. Fixed Font Size
Use "em" instead of "px". It makes the page more accessible.
6. Page Titles With Low Search Engine Visibility
Good title make your web page more visitors.
7. Anything That Looks Like an Advertisement
Don't do that. Because users ignore advertisements.
8. Violating Design Conventions
Be Consistency!!
9. Opening New Browser Windows
Visitors may ignore that too.
10. Not Answering Users' Questions
Visitors can found what they want, then they will gone.