Actually, the docs are pretty clear about this (from http://www.truecrypt.org/docs/hibernation-mode.php):
"Note: If your system partition/drive is encrypted by TrueCrypt, the TrueCrypt driver automatically prevents Windows from hibernating the computer (for information on how to encrypt the system partition/drive, see the chapter System Encryption)."
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Actually, the docs are pretty clear about this (from http://www.truecrypt.org/docs/hibernation-mode.php): "Note: If your system partition/drive is encrypted by TrueCrypt, the TrueCrypt driver automatically prevents Windows from hibernating the computer (for information on how to encrypt the system partition/drive, see the chapter System Encryption)."