As many have noted already, Obama seems to have adopted with Hillary the aggressive foreign policy of the Clinton administration. Mary Ellen O'Connell - an international law professor at the University of Notre Dame - wrote an article against this trend. It shows that Hillary is not the only hawk in the new administration, but one of many. It looks like little will change in US foreign policy when Bush leaves.
See also the following articles: Barack Obama criticised for failure to signal change in foreign policy and Obama's Uninspiring National Security Team.