If you are trying to get your game produced by a publisher, get to know one or two of the producers at each of your target publishers. Stay in regular contact with them so they know your availability and projects. Frequent communication keeps you at the forefront when they are making a list of potential developers for their projects.
Once you have your product placed at a publisher, establish and maintain a positive relationship with your producer. Getting to know him will help you get the most out of that relationship.
Finally, as you are nearing the completion of your project with that publisher, make sure the producer knows you are ready to take on more work.