The ever so practical Jakob Nielsen gives his list of Top 10 Web Design Mistakes.

They’re so easy to overcome, yet so often overlooked. In my opinion, at least six of these mistakes are easily fixed with a good blog or simply good content management software.

1. Bad Search
2. PDF Files for Online Reading
3. Not Changing the Color of Visited Links
4. Non-Scannable Text
5. Fixed Font Size
6. Page Titles With Low Search Engine Visibility
7. Anything That Looks Like an Advertisement
8. Violating Design Conventions
9. Opening New Browser Windows
10. Not Answering Users’ Questions

Concerning #1 and #6, here’s an example from my personal experience. Dentyne-isms are the cute “parables” on the back of Dentyne gum packages. Type “dentyne-isms” into a Google search. The top two links are to this blog. Dentyne’s website doesn’t even show up in the search results.

Apparently people really like these dentyne-isms. Right now, the post that comes up in the search results has over 50 comments. It’s one of the top search terms bringing people to my blog.

Read the rest of Jakob’s Top 10 Web Design Mistakes. His details are worth the few minutes of reading.