Be an Expert
Lend your expertise to your clients.
If a client has an informal panel of advisors, offer to join. One of the problems for people who work independently or have small businesses is that they don't have enough people to use as sounding boards. By acting as an expert, you'll send your credibility soaring and you'll make solid contacts with other advisors. Creating a similar panel for your business is also good practice.
Excerpted from 303 Marketing Tips: Guaranteed To Boost Your Business