Disk Repair Utility can't fix problem - help needed.

I have an external drive that I have been using with Time Machine. Last night I closed up the MBP and waited for the LED to start pulsing, then I unplugged the drive and packed stuff up. When I got home, I plugged the drive back in and opened the cover on the MBP. The drive icon was not on the desktop, and there were no other error messages.
I ran Disk Utility and did a "Repair Disk", which stopped after a few seconds with the following:
Verify and Repair volume “OneTouch4 M”
Checking Journaled HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Invalid sibling link
Volume check failed.
Error: Filesystem verify or repair failed.
Is there anything I can do at this point, other than erasing the disk and starting over? I don't THINK there's anything vital in the backups, but still I'd rather not lose them.
Walt

Yes, that's what I usually do. I was in a hurry, and I thought "If the disk is there when I go to sleep, and is put back before I wake up, I won't know the difference". Obviously not true - I guess the Mac is still doing stuff when it's "asleep".
Thanks for the tip on Disk Warrior - there's nothing on that disk that's worth $99 to me, so I think I'll just erase it and start over. It has only the most recent 2 weeks of TM backups on it, the rest are on my previous TM disk.
Walt

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Every time I run Disk Utility on my system's "Macintosh HD", it returns this error list:
Repairing permissions for “Macintosh HD”
Warning: SUID file "usr/libexec/load_hdi" has been modified and will not be repaired.
Warning: SUID file "System/Library/PrivateFrameworks/DiskManagement.framework/Versions/A/Resources /DiskManagementTool" has been modified and will not be repaired.
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But this repairing process takes about 4-5 minutes, while on Tiger it took about 1 minute.
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Message was edited by: cornelius

Disk Repair Utility can't fix problem - help needed.

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