I maintain good relationships with the members of my team by having coffee and lunch meetings.  This keeps me in touch with what is going on with them socially as well as professionally, so that I can recall their services readily in mind when I come across referral opportunities.  Typically, when I have a referral, I will go ahead and make the connection via three way text or email, and then I mark it in my notebook.  That way, I can formally memorialize it with a referral record at my meeting, but will not have overlooked actually making a timely referral.