What's the best way to check what's on my hard drive?

Hello Everyone...
I'm fairly new to the mac experience so I apologize in advance if this information is readily available elsewhere...
I'm trying to find out what is taking up the most space on my hard drive with hopes to move or delete files... I did several searches here on the forums and well as googled and came up with some freeware programs like Disk Inventory X, What Size?, and Omni... Any opinions on what works best? or any other ways I can find these files? Thanks for the help...

The following articles have some good tips:
Freeing space on your Mac OS X startup disk
Freeing Up Hard Disk Space
Running maintenance routines is critical to keeping the drive clear of unneccesary files:
http://www.macworld.com/2005/01/features/preventmacdisasters/index.php
http://www.thexlab.com/faqs/maintscripts.html
Since you're a newcomer to the Mac, see these:
Switching from Windows to Mac OS X,
Basic Tutorials on using a Mac,
MacFixIt Tutorials,
MacTips, and
Switching to the Mac: The Missing Manual, Leopard Edition.
Additionally, *Texas Mac Man* recommends:
Quick Assist.
Welcome to the Switch To A Mac Guides, and
A guide for switching to a Mac.

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