Since no one has answered this I can only add that if you can wait till December, the new RAE ratings will come out, and this time is will show a profile rating of the staff of each department e.g. 20% produced 4*, 30% produced 3* etc.
The only other rankings is the new 2009 Times league that came out about a month ago. The Guardian and a few other places produce similar leagues....but I think all of these are fairly subjective and never reflect the true quality of a university.