My HD is eaten up !

I noticed ( usine OmniDiskSweep) that large files are eating my HD.
One in particular is located at ~/private/var/log/asl
the size of this log file is about 21GB
what is this and can I delete this log file?
What other log files can I delete?
I wish i could upload the2 snapshots taken of this Log file !
thank you

They are dated individually because these are essentially runaway user log files. asl stands for Apple System Log, and yes it is entirely safe and prescribed you delete them !
You can manually delete them and or use a program such as onyx to delete them as well. A great article of interest to you: http://reviews.cnet.com/8301-13727_7-10329979-263.html?tag=mfiredir

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