Never abuse these names or sell them to anyone else, and make sure that you put a privacy statement on your site so visitors will know exactly how you re going to use their names. Send them about two mailings a month at most, and make sure you include some useful information - not just a bunch of ads. You can also purchase email addresses in very targeted categories. However, this type of promotion tends to be expensive, with names costing 15 to 20 cents each. Purchase a sample of the list first and do a test mailing.
Some companies offer a banner ad exchange program.
You put a banner space on your site, and you get a certain number of ads on another site in return. You can even select the type of sites on which you want to put your ads. Beware of promotions and opportunities that address a large group of people outside your customer base. They tend to attract a huge audience of people that aren t interested in your product or site, and instead cost you money and time, especially if you re paying for your bandwidth. Get your name out there any way you can.