The World University Rankings report for 2011/2012 has just been released. The report ranks the top 300 universities in the world:- overall, by subject rank area, and as voted by employers.
The UK fares well with 4 universities in the world's top 10, with Cambridge taking out the top spot.

The top 10 is as follow:

1. University of Cambridge
2. Harvard University
3. Massachusetts Institute of Technology
4. Yale University
5. University of Oxford
6. Imperial College London
7. UCL (University College London)
8. University of Chicago
9. University of Pennsylvania
10. Columbia University

Elsewhere in the top 50:

20 Edinburgh
26 Australian National University
27 Kings College London
29 University of Manchester
30 University of Bristol
31 University of Melbourne
38 University of Sydney
48 University of Queensland
49 University of New South Wales
50 University of Warwick