1. Use the three big local listing services
Registering your business with Google Places allows it to be found more easily on Google searches and it shows up on Google Maps. All you have to do is fill out the form and register, then get your business verified through their confirmation process, which can be done either with a phone call or snail mail. Yahoo! also has a big database of businesses called Yahoo! Local. It's free, and is certainly worth the few minutes it takes to set up. Microsoft's Bing has a similar service that's easy to sign up for.
2. Embrace social media
Social media isn't just a tool to gain exposure—it has now become a necessary time investment for every business to make. You can tie in ads and offers on your Facebook page and have a direct channel with your customers on Twitter. Networking on LinkedIn—both at the personal and company level—can be another way to help your startup.
3. Start a blog
A blog not only helps your company get its name out through followers, but is a way to connect with your consumers more directly. But remember that one of the major keys of blogging is to keep your stream updated as frequently as you can. A dormant, abandoned blog is worth nothing.
4. Put up multimedia on YouTube and Flickr
YouTube provides a free way to distribute creative promotional videos, but in order to succeed you must put up content that people want to view and are relevant to your business—a simple ad will not work. A Flickr profile can also help by giving you one place to compile all the photos for your business, and allows you to link back to your website.
5. SEO your company website
Search engine optimization cannot be underestimated in the world of constant Googling. Pick up a book or head over to an online how-to-guide on SEO and make sure your site is primed for performance on search engines.
6. Press releases
Every time your business does something newsworthy, don't hesitate to shoot off a press release—maybe folks will pick up on it. They're a powerful media tool to use to help generate publicity, and having free distribution of them is a bonus. There are dozens of websites out there that you can use for your press releases, such as PRLog and 24/7 Press Release.
7. Join a relevant online community and contribute
Every niche has communities online that you can get involved in. But just signing up for a forum and posting every once in a while about your business isn't beneficial for anyone, and will likely just annoy people. Actively contribute and build a rapport with the community, while keeping your business out of it. Passively promote your business by putting a link in your signature or mentioning it only when the context is appropriate.