JurisPro is a free database of expert witnesses.  The database goes well beyond just listing an expert’s contact information.  Some profiles include photographs, the respective expert’s webpage, references, CV, and contact information.  A search of more common areas of expertise resulted with a list of experts in the New York area.  As I searched for more obscure areas, the geographical search expanded beyond New York, even if I limited the search to New York. 

The webpage also provides a free e-newsletter entitled "The Pro."  For a free service, this database goes well beyond what I have seen floating out there on Web.