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There's nothing obviously wrong with what is shown there. Have you tried manually shutting down daemons and seeing if any of them hang? Can you use telinit 1 to change to single user mode successfully? If that works does the shutdown from there work properly?
I don't think you can manually unmount /dev/hda2 as it is your root partition (according to your fstab)!
That error message:
/dev/hda2 was not cleanly unmounted..<blah blah blah>"
indicates that your previous Linux boot was not properly shutdown, and that the system will run a fsck on it to check for errors/corruptions in its file structure.
Some distro's prompt for a Y/N to run the fsck!
If the fsck is not run, Linux may or may not prompt again on the next boot.
You should probably let the fsck run as it is a check for corruption in the fs stucture.
If the system is repeatedly displaying the error message even after running the fsck, then you may have to boot from a Live-CD and run fsck on /dev/hda2 (easiest path), else try to fix the boot script that run fsck (more work).
You cannot run fsck on the root partition when it is in use (which will be the case if you boot from the hard drive) as it cannot run against a mounted partition (or r/w one anyways)!