From one of the useability experts:
http://www.useit.com/alertbox/designmistakes.html
Some good tips here for people that are designing t-shirt ecommerce sites (especially 2,3,8, and 10).
Here's the top 10 list, visit the website for explaination of each issue:
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Originally Posted by useit.com |  | | | | | | | | | - Legibility Problems
- Non-Standard Links
- Flash
- Content That's Not Written for the Web
- Bad Search
- Browser Incompatibility
- Cumbersome Forms
- No Contact Information or Other Company Info
- Frozen Layouts with Fixed Page Widths
- Inadequate Photo Enlargement
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The full article is here:
http://www.useit.com/alertbox/designmistakes.html