News releases are not the best way to get major media coverage, but they can be used to increase the frequency with which your company name appears in the press.
Press releases will get you coverage in set features like business notes, and new personnel columns. They also provide a good way to let allies, employees and customers know what you are doing. For these purposes, post releases on the company website, send out by e-mail, or distribute by one of the services like PR Newswire or PR Web.