The key players for India will be Sachin, Laxman and Dravid, with the bat and Kumble with the ball. The top 3 Test batsmen in the side have to bat through the innings and build large partnerships, since that is the Australians' weakness- they don't like large partnerships much. Despite Harbhajan's success in 2001, Kumble is more seasoned and is the best bet.
The dark horses will be Harbhajan and Sehwag. Harbhajan has played a little and had a horrific last Test against the Australians, but his improved performance today will give him an advantage. The 20 runs or more he scores will also count, though he should convert them. Sehwag has had a horrific run of form, but when he strikes, he can strike hard. Pathan may not have too many wickets a match, but he can improve on that, and even the runs he scores will be vital. Chopra may not have made too many, but he might just get it this time.
The Australians are a superior fielding side, so any team playing them will have to be very good on the field, but the Indian team has three weak links in Ganguly, Zaheer and Parthiv. Ganguly's batting form (or lack of it against pace) notwithstanding, he still can't stop a rolling ball! Parthiv takes five catches, then drops two, and he hasn't made to many stumpings qhen he gets the chances- that makes him a weak link behind the stumps. Will Zaheer stay fit throughout the series? We may never know! Nor can anyone predict what Agarkar will bowl, but it won't be anything great.