Here is a good article from Realtor.com that talks about lead generation systems:
http://www.realtor.com/advice/4-secrets-to-success-how-to-manage-high-volume-leads/?cid=EML301472
Basically it comes down to:
- collect the leads (tigerleads/pay-for-leads-via-realtor.com)
- respond fast (fivestreet).
- track the communication (yesware).
- pull in accurate info from other public sources (rapportive).
- distribute the leads to others and cherry pick the good leads (good-old-greedy-capitalism).
Welcome to the new world of real estate.