There was a conflict between the Lenovo fingerprint software and PGP whole disk encryption on T400s and T500s.  If the Lenovo fingerprint software is installed, using your domain password at the PGP boot prompt didn't work and you could lock yourself out.  You'd have to use a one time password to boot.
Under Windows 7, fingerprint drivers are native and, if you enable the fingerprint reader and enroll your fingerprints, it works fine with PGP WDE.