How to search by File Size--Freeing up Disk Space

I'm wondering if there is a way to search my hard drive for the largest files...I have a 120GB hard drive and no space left, and I want to find out what is taking the space...
Is there a way to view the largest files on my hard drive?
Is there a utility to help clean up files that are no longer being used or that are irrelevant?
Thanks!
-dave

Look at these links.
Where did my disk space go?
http://www.macfixitforums.com/showflat.php?Cat=&Board=Forum38&Number=770243
Freeing space on your Mac OS X startup disk
http://www.thexlab.com/faqs/freeingspace.html
Increase HD Free Space
http://macosx.com/forums/howto-faqs/275191-how-easily-increase-hd-free-space-lap top.html
 Cheers, Tom

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pstein wrote:
...The following code does not work. Work?! It does not even compile! Please consider posting code in the form of an SSCCE in future.
Here is an SSCCE.
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class ListFiles {
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i +
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