wow six years!?

erm..bring warm clothes :P

well there are definitely the regular sites you have to go see..the brandenburger tor, reichstag, museeumsinsel..thats all in the center and you will find it hard to miss those.
berlin is quite interesting since it well..used to be divided. so there are a lot of historical sites..parts of the wall, checkpoint charlie etc
there is the sans soucis castle in postdam (aboot 40 min ootside of berlin).
and then lots of small shops, galleries etc in prenzlauer berg( a part of town)but in six years youll probably find oot more than me since ive only really been there for work!

but its a fun place to be atm..brangelina love it too :D

since you'll stay for six years and not just a couple of weeks I strongly suggest you travel around if possible. There are a lot of interesting cities, Hamburg, Munich, esp. Munich. Germany is so different, even if you just take a look 100 ahead. Mannheim, Stuttgart, Regensburg!

^^ totally..oh and try to learn some german :)
most forgeigners i know never learn it cause people will always speak english to them

I dunno.... I am moving there too. What year are you moving?