Hard Drives Bare After Forced Restart!!! HELP!!!

Running new Mac Pro w/ plenty of RAM, and the latest OS.
Was installing Xcode with a few programs running in the background.
Time Machine appeared to have kicked in during the install and Xcode just seemed to hang. Then, suddenly all text disappeared from all Firefox tabs, and all other programs stopped responding. I let it sit for over an hour with no response. I couldn't force quit things, though I was able to quit Mail and Calculator without issue. I could not, however, interact with their windows directly.
After another 30 minutes of total system lock-out (even the dock was stuck) I pressed and held the power button on the front of the unit to turn it off.
When I turned the machine back on it could not find the start-up disk. So, I started up with the Install DVD and ran Disk Utility...
The two internal drives on my machine both registered and were verified in good working order, but they were now BLANK DU registered them as having a tiny bit of information on them when only 2 hours before there was literally hundreds of gigs on board... years worth of valuable data.
I'm not looking for a scolding regarding my not regularly backing up, nor to be admonished for shutting the machine off the way I did.
Has anyone ever seen something like this?
I'll be calling Applecare first thing tomorrow, but am wondering if this might be something Disk Warrior can lend a hand with. Thoughts and recommendations welcome.
Thanks all for your consideration.
Best,
Jason
ps > wary of recovering from Time Machine back-up due to the fact that I'm not sure one of the drives was backing up, and I dare not overwrite the drive while the chance to recover wholesale through the use of a tool like Disk Warrior exists.
Message was edited by: jhcovert

UPDATE
I spoke with Applecare this morning and they instructed me to restore from my TimeMachine back-up and that my secondary internal drive (ie. the MORE important drive) would have definitely been backed up as well.
I restored and... voila!... my basic desktop operating system is back.
That's the good news, however, the bad is that the secondary internal drive DID NOT restore.
As I mentioned before, the drive is being read as healthy and EMPTY, which is mind boggling. I assumed that this was a directory issue, but neither DiskWarrior nor Data Rescue can determine that there is anything wrong with the directory. Data Rescue's "Quick Search" revealed no additional files save for the basics you would find on a barren drive. I am currently running their "Deep Search" which should take several hours, but my question for you guys is this: should Data Rescue come up empty is there anything else I can do? Or is the drive well and truly borked... empty... caput?!? Do I let DiskWarrior attempt to rebuild the directory or am I just throwing fuel on the fire and potentially overwriting data that might be useful in recovery.
Do I then take it to a forensic pro to go over the drive with a fine tooth comb?
Recovering this data is approaching a "no price too high" situation.

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