BodyParts3D liver
The liver from the BodyParts3D database, using TiZeta's cut down import into blender:
http://www.4shared.com/get/QconRIAF/BP3DScaledDecimated_simplified.html
Licensing and full detail parts are available from the BodyParts3D database:
http://lifesciencedb.jp/bp3d/?lng=en
Gallbladder included as a bonus for any aspiring surgeons out there :) Thanks to BodyParts3D, Cbonsig and TiZeta!