'Other' taking too much Hard Drive space

[Arzuhl]

Hey guys.
First time posting so please be gentle.
I have a problem with my Hard Drive reporting my usage, it is a 1 TB drive in a 2011 27" Imac, running Lion.
I have installed a 102gb partition for Bootcamp also.
Usage is as follows, Audio 16.06 gb
Movies 40.86
Photos 268.31
Apps 8.36
Backups 0kb (as I back up to an external hard drive)
Other 478.85!!!!!!!!!!!
When I enter Finder and click on Get Info from my personal folder that contains all my files on the MacIntosh HD it says I have used 369.05.
The Mac is saying I only have 85gb of free space, surely that cant be right?
What is going on with the 'Other ' section of the drive and how can I delete the files in there.
Any help appreciated as I have only had this Imac since February and Im sure I have not put that much information on it.
Thanks in advance.

 

[GGJstudios]

Use DiskInventory X (pre-Lion), OmniDiskSweeper, JDisk Report or GrandPerspective to see how space is being used on your drive.

 

[Arzuhl]

Wow, looks like a tough one.
I ran Omnisweeper and it has told me about my files but no reference at all to what or where the 'other' files are.
Been on to Apple tech support and they are stumped as well, waiting for a call back tomorrow for further help.

 

[theSeb]

Open terminal

type in

cd ~ [hit enter - do not type this]
du -d1 -h [hit enter]

You'll get something like this

1.0M ./.dropbox
4.0K ./.dvdcss
19G ./.Trash
200M ./Code
3.9G ./Desktop
30M ./Documents
3.7G ./Downloads
7.9M ./Dropbox
7.0G ./Library
16G ./Movies
10G ./Music
6.0M ./Pictures
0B ./Public
76K ./Temp

Tell us what you see?

Then type in

cd / [hit enter]
sudo du -d1 -h [hit enter]

What do you see?