It's also a good resource for useful tips and information about site promotion. Exchange links with related sites, but make sure they have a logical connection to yours. It's much more useful to have a brief list of carefully selected links that are likely to be of interest to your site visitors. Check out other sites before you link to them. After all, your visitors are trusting you to make good recommendations.
Email marketing can be a valuable tool, if it's done right.
Set your Email program so that your URL, and possible a short promo statement are part of your signature. Participating in a mailing list can also be a good way to promote your web site, but again, watch out for the scam artists. Mailing lists and newsgroups have widely varying policies. You might do this manually at first. As your list grows, you can automate the process with software programs designed just for this purpose.