mac startup disk full

My startup disk is full and when I go to About This Mac is shows that most of the disk is full with 'Other' file type - see attached screenshot.

I've done a bit of research and I think it has something to do with yahoo IMAP downloading messages over and over again. I've tried to look for .OfflineCache and I've tried to do a couple of other things... (recovered messages.mbox or something), but I really have no idea what I'm doing.

Can someone help me kill the 'Other' files that are taking up all my space??

screenshot of About This Mac showing my disk is full of 'Other' files
BlingoAsked:
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strungCommented:
There are all sorts of things that could be causing your problem, including left over scratch files from things like PhotoShop, overgrown spotlight indices, etc.

Your best bet is to download Whatsize:  http://whatsizemac.com/ and search for large files. If you don't have room to download it to your hard drive, download it to a thumb drive.
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Sigurdur ArmannssonDesigner Commented:
Omnigroup Disk Sweeper http://www.omnigroup.com/products/omnidisksweeper/ does similar and is free.
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BlingoAuthor Commented:
Thanks to both of you.. I downloaded both and they both showed pretty much the same thing. It's as I suspected - it's all choked up by mail in the recovered items folder. See attached screenshot. Do you reckon I should just kill everything in that recovered mail folder? Any idea how to stop this from happening again (aside from removing yahoo as a mail account in the mail app).

screenshot of swept drive using WhatSize
screenshot of swept drive using omni
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strungCommented:
Is your Yahoo account POP3 or IMAP?
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BlingoAuthor Commented:
IMAP
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strungCommented:
See link above
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BlingoAuthor Commented:
Awesome... thanks! Last question - to free up the space, do you think I should kill everything in that recovered messages folder? I assume if I do that it won't impact any other emails that are sitting in the inbox or other folders...
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strungCommented:
I would, but to be on the safe side, you could copy it to a back up disk first.
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