THES produced a list of world's top 100 science universities in 2006.
Below is the Top 20 list:

RANK, INSTITUTION, COUNTRY

1 Cambridge University UK
2 Oxford University UK
3 U of California, Berkeley US
4 Harvard Univ US
5 Massachusetts Institute of Technology US
6 Princeton Univ US
7 Stanford Univ US
8 California Institute of Technology US
9 Imperial College London UK
10 Tokyo U Japan
11 ETH Zurich Switzerland
12 Beijing U China
13 Kyoto U Japan
14 Yale Uni US
15 Cornell Uni US
16 Australian National U Australia
17 Ecole Normale Supérieure, Paris France
18 U of Chicago US
19 Lomonosov Moscow State U Russia
20 U of Toronto Canada

Source: THES-QS 2006

World University Ranking Tables

America - US News & World Report, The Princeton Review, BusinessWeek
Canada - Maclean's, Gourman Report Ranking of Canadian Universities
UK - Sunday Times, Guardian, Times Good University Guide, Daily Telegraph
World - Shanghai Jiao Tong ARWU Rankings, Webometrics, Newsweek
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