Given the global lack of trust in governments, the press, and other humans, I'm not sure this will answer everybody's questions as to who is doing what and where but try:
BBC News - Malaysia Airlines: How is the search being carried out?
They provide a map of the search areas which include the South China Sea, the north half of the Malacca Strait, and central Malaysia (yes, land). Three P3s (2 Australian, 1 US Navy), multiple C-130s and assorted other maritime surveillance aircraft, helicopters, both land and sea based from 14 countries are involved, with more coming. Ships are being deployed but the bulk of the search patterns are being flown.