Australia, South Africa and England are the masters when it comes to sledging even New Zealand are good at it. I remember when Bangladesh came to bat against them at World T20, Kyle Mills said something to Tamim before their batting innings started and then Tamim got out in qucktime by playing a silly shot. India too also sledge but they always fail at it. I remember in 2010 I think that when Zaheer Khan got battered by Tamim, he was trying to get into his head but failed. Infact Tamim barged into him to show how p***** off he was. Here's a link on Youtube:
http://www.youtube.com/watch?v=uI0LGgA2Mls