title: SharePoint lookup column across site-collection boundary
body: <p>The basic situation is that I have a list of company contacts that exist in one site that I would like to share. The contacts are referenced from a list within that site, and I would also like to be able to reference them from a list in another site collection. Lookup columns can only lookup values from a list within a site, but this is the functionality that I would like across site collections.</p>
  
  <p>Is there a common solution to this sort of requirement? </p>