Theres a good thread about what to do in Berlin here
my personal reccomendations would be the Check Point Charlie and the Check Point Charlie museam. Also, the Brandemburg gates are an awesome site. Berlin is one of my favourite cities in the world with so much to do and see. An update to the list is I understand they have already torn down the East German Parliament building.
Hope the link helped
I have been to: Canada, USA, Iceland, Britain, France, the Netherlands, Belgium, Spain, Poland, Germany, Sardinia, Switzerland, China, Argentina, Brazil, Chile, Uruguay and Morocco.
Do to list: [color=blue][color=black] Australia, New Zealand, Austria India and Bolivia.
[color=blue][i][font=Verdana][color=black]"I'm just another stranger lookin' for the promised land"