President Obama made official the Cabinet nominations he has already publicly announced. He signed the paperwork for that, in the Capitol building, shortly after being sworn in as president. The Senate will go through its normal procedure this afternoon, confirming by voice vote those nominations that have been cleared. However, that excludes most of the major Cabinet posts, as described in this report from Congressional Quarterly.
There seems to be a consensus that all of the nominations will eventually be approved.
Obama has yet to announce a nominee for secretary of commerce, to replace Bill Richardson, who withdrew himself from consideration.