Help with corrupted HD: how to back up files

ok so i had a problem yesterday: when i hit the power button, my macbook would stay at the white screen with the spining load indicator and the apple logo. same would happen when i started up while holding the option key. anyways i started it up with the original OS disk. in disk utilities i tried to repair the hard drive, unsucessful and is says this:
Invalid sibling link
rebhuilding catalog b-tree
the volume macintosh HD could not be repaired
updating boot support partitions for the volumes as required
ERROR: DISK UTILITY can't repair this disk...disk, and restore your backed-up files
how do i back-up my files?
Message was edited by: timxj
Message was edited by: timxj

Welcome to the Apple discussions.
When there is an issue like that, often Disk Warrior or TechTool Pro can fix it. Disk Warrior is generally the preferred program. http://www.alsoft.com/diskwarrior/index.html
You can then back up the files once you get the drive back in shape.

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