Markus Urban - 10 Things That Will Make Or Break Your Website:

1. "EASY is the most important feature of any website, web app, or program.
2. Visual design and copy are extremely important.
3. Open up your data as much possible.
4. Test, test, test.
5. Release features early and often.
6. Be special.
7. Don’t be special.
8. If you plan on developing a successful webapp, plan for scalability from the ground up.
9. Watch, pay attention to, or implement right away
10. User generated content and social software trends"