Embroider it on your shirt. Most people still learn about WWW sites from friends, colleagues and media references so don't ignore this venue. Get the word out on the Internet, too. Include your URL in your signature file so it gets transmitted with every e-mail message. Most importantly, get included on other sites.
Different databases use varying techniques to scarf up new URLs.
To get in Yahoo, you have to submit your own site. Don't try to wing it. If the list isn't being operated by a competitor you have a good chance of getting included. Such lists often include a link or form that you can use to submit your address. There are several San Antonio business lists.