Australia: I think Aussies r going great and they r performing very well in all three series which they have played against Pakistan, New Zealand and West Indies. No doubt their performance is remarkable in test, one day and in T20 format of cricket.
New Zealand: If we see the performance of New zealand in last few months then No doubt they have played very well against Pakistan and Australia. Though they r unable to beat Aussies but still they have given the tough time to the Aussies, so probability is there, and their chances to win the ICC T20 world cup 2010 are so much.
Srilanka: Srilankans are always very good in T20 format of cricket, and they r really fully capable to give tough time to any cricket team in the world, further more they r able to win this mega event as the captain of Sri lanka is Kumar Sangakara, which everyone know a superb player.
India: Indians are becoming father of T20 cricket. As they r organizing many events like IPL and Indian players are use to in playing this type of cricket. I think they r very much experienced in the T20 cricket and they can really perform well in this format. Moreover, their overall performance also very good in past few months and they r giving the tough time to any cricket team even Australia.
England: England have also number of talented players who can perform very well in every scenario, they are much talented and use to play cricket so much so it is never difficult for England to come and lead the series.
South Africa: I have observed that South Africa are also a big team in the cricket world and they also have equal chances to win this twenty twenty cricket world cup 2010, they are passionate and really a big name, they even compete with Aussies very easily.