Australia hurt itself at the selection table (in retrospect) with dropping Hogg for Tait, and Hayden out is a massive blow for any team. That said, this is the supposed second string Indian seam attack, so I don' think that's an excuse.
Well done India - they were the better team. Clark and Johnson did well to make it (somewhat) close at the end, but in reality they were left way too much to do by the top order. The middle order (Ponting, Hussey, Clarke and Symonds) played pretty well in the second innings - Ponting was masterfully worked over by Sharma but had looked better than he had in the previous innings this series, Huss and Symonds got rough decisions but had looked dangerous, and Clarke was the best batsman for Australia in the second dig. It was the lack of contribution from both openers in both innings, and the failures in the middle order in the first innings that really cost us. You can't give away 100+ on the first innings to a quality opponent and expect to win the match. That and Tait's surprisingly poor showing - I'll admit I called for his inclusion, and have thought that he deserved a spot ahead of Johnson, but on his showing here, he needs to go play some Pura Cup and get himself right.
Positives for Australia: Johnson played his best match yet. Ponting worked towards some kind of form. Lee continued to be brilliant.
Summary: Well done India - you thoroughly deserve this win. I hope you enjoy it, and I hope you come ready to play in Adelaide because we don't take defeat lightly, we'll get Hayden and Hogg back and be waiting to open a big ol' can of whup-ass on you there.