Service beyond expectations and intensive personal networking is a good formula for success.

By always providing the kind of service that my clients would want to refer to their sphere.

I like to call many of my past clients and without asking for referrals, it reminds them I am in the real estate business.  

I provide quality service for customers and quality training for my students and they help spread the word.  I always ask how people heard about me and many are referrals and repeat customers.

Fertilize, weed, water, harvest.

Then there's that little thing that separates the professionals from the armatures. The pro knows how to ask for the business with skill, grace and inspiration.

post cards, facebook, little gifts, linked in are all part of my game plan

I am doing popby's this year as Brian Buffini suggest and I am doing monthly sensation postcards

Istay in touch with them like mad and always try to provide value in my connections.

I treat my referer's just like any client.  Constant contact, thank you notes, lead generation.  Mark

Keep in contact with your former clients and they will remember you when someone need to buy or sell a home.

I treat my clients like family and they keep the pipelines open.

William Piotrowski - stay in touch with your sphere. How? I follow Brian Buffini's referral systems. Simple and yet, very powerful! This system teaches us how to stay in touch with your Sphere, past clients. To an extent, it teaches you the dialog for asking the referrals, too.

I agree with Joan Cox - you need to stay in touch w/ your past clients and sphere - but I think you need to "train" them to think of giving you referrals and put you in touch w/ people who are looking for a realtor

I keep talking to everyone I know.

Provide the best customer service possible and try to "wow" them along the way.  You do that and you'll win their loyalty and trust.  The referrals will come, especially if you continue to keep in touch with them after the transaction closes.

By being visible.

Keep calling.