Best actor & Best actress
Both totally deserve winning the award. :D
Best picture/Best director & Best supporting actor
Kathryn Bigelow and "The Hurt Locker" rock. If you haven't seen it yet, do it as soon as possible. The drama about bomb disposal in the Iraq war is a really emotionally exhausting account and IMO seriously underrated.
♥ for Waltz. Nothing more to say to that. ^^