Arrggghhhh!
I just got hit with this error Friday night, after no changes, I just shutdown after using my laptop on the train, and it wouldn't reboot at home? (unclean shutdown?)

Is there any fix? I need to recover some files, at least.

I am using an old Dell Inspiron, Fedora 10 with LVM, dual booting with MS Windows XP in NTFS. Windows boots fine. The Grub menu seems OK, but I get the same error after choosing any Linux Kernel I choose.

Thanks for any help you can direct me to.

The issue I encountered would only affect newly installed kernels. If all the kernels in your grub menu have suddenly become unbootable, it might be a different problem.

Anyway, your best bet is probably to boot from the F10 LiveCD, and try to mount your filesystems.