Over 2 decades ago, Corum's founder, Bruce Milne, wrote "Software Company Guerilla Marketing: How to Succeed in the Software Wars with a Carefully Targeted, Low/No Budget Marketing and Sales Campaign."  Here’s another of his time-tested ideas: Customer Referrals Program. You may want to offer discounts, free software, or prizes to customers who make referrals that close. This is best done as part of a promotionalcampaign with a deadline to create a sense of urgency.