Is there a program that can find dublicate files and other items on your computer?

[TheSwede]

As above really, want to be able to search through all my hard drives and see if I have duplicates of any files or programs, then have the option of either keep them or delete them.

Is there such a program around?!?

 

[TheVoice]

DoubleKiller:
http://www.bigbangenterprises.de/en/doublekiller/