What birdman has is a good business idea,though it may not be coming out well to some people
@birdman,maybe u need to get it all formal (like other database companies),have a website,and include corporate databank too,ability to sort agegroups,proffession,etc.
http://www.zawya.com/ is a good example,where they allow u to browse companies for a few days,thereafter you are required to register for a hefty fee.
Though I've also seen people seling them as you do on a one-on-one basis.
All the best!