Here’s Jakob Nielsen’s list:
- 
- Unclear Statement of Purpose
 
- 
- New URLs for Archived Content
 
- 
- Undated Content
 
- 
- Small Thumbnail Images of Big, Detailed Photos
 
- 
- Overly detailed ALT Text
 
- 
- No „What-If“ Support
 
- 
- Long Lists that Can’t Be Winnowed by Attributes
 
- 
- Products Sorted Only by Brand
 
- 
- Overly Restrictive Form Entry
 
- 
- Pages That Link to Themselves