I don't know enough about European cities to say why they might have ranked them outside of the top ten. The scores for the top ten were all pretty close though, so there could be plenty of cities outside of the top ten that score quite high as well. Unfortunately they want you to pay to see the whole list.

Because I love lists, here is a list from Monocle magazine's 2010 World's Most Livable Cities index, which appears to be much more inclined to like Europe. It aims to rank by quality of life, and some things that it takes into account that aren't specifically mentioned by the Economist ranking are quality of architecture, international connectivity, tolerance, and access to nature.

1. Munich, Germany
2. Copenhagen, Denmark
3. Zurich, Switzerland
4. Tokyo, Japan
5. Helsinki, Finland
6. Stockholm, Sweden
7. Paris, France
8. Vienna, Austria
9. Melbourne, Australia
10. Madrid, Spain
11. Berlin, Germany
12. Sydney, Australia
13. Honolulu, United States
14. Fukuoka, Japan
15. Geneva, Switzerland
16. Vancouver, Canada
17. Barcelona, Spain
18. Oslo, Norway
19. Montreal, Canada
20. Auckland, New Zealand
21. Singapore, Singapore
22. Portland, United States
23. Kyoto, Japan
24. Hamburg, Germany
25. Lisbon, Portugal