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: hold an open house at a new installation. Your users would like publicity, too, and often are willing to cooperate in an open house to show off their new system. This works especially well in conjunction with local dealers.