100 GB HD was a BTO option only. I doubt there are too many out there with that.
Unfortunately, the 7200rpm drive options that the 15" and 17" PowerBooks had were not available on the 12".
It also doesn't have FireWire 800, dual-link DVI, backlit keyboard, PCMCIA slot or a double-layer SuperDrive.
It does have the sudden motion sensor, AirPort Extreme card, Bluetooth 2.0+EDR, etc.
The refurbs on Apple.com, interestingly, only appear to ship with iLife '05. Mine was bought in June '06 (just after it was discontinued) and came with iLife '06.
It's a really nice little computer, though I'm going to try to sell mine soon to replace it with a MBP. (The reason I bought it was that I didn't want to spend the money on the rev. A MBP when I knew that a refined rev. B would be coming soon - as it did. I couldn't wait as I needed a computer right then.)