Create an online club or association. Tell your visitors what's included in the membership and what it costs to join. Offer them a free membership if, in exchange, they link to your web site. Just think, you will either make money or get some no-cost advertising.

Allow people to use an online service or some utilities from your web site if, in exchange, they link to your web site. The online service could be an e-mail account, search engine submission, web page design, copywriting, proofreading, etc. If they don't want to link, you could offer them a subscription fee for the service.

Offer a free e-book to your web site visitors. The e-book should be related to your target audience. Allow them to give the e-book to their own web site visitors by linking directly to your web site. You could also allow them to upload the e-book to their own web site and give it away. Just include your link in it.

You could offer your visitors a discount on all the products you sell if they subscribe to your free e-zine. For example, you could say, "Subscribe to our free e-zine and get 50% off all our products!" Another example, "Subscribe to our free e-zine and get $8 off our brand new e-book!"

You could offer your visitors a free e-book if they subscribe to your free e-zine. For example, you could say, "Subscribe to our free e-zine and get a our new e-book for free!" Another example, "Subscribe to our free e-zine and get five e-books with full give-away rights!"

You could offer your visitors a free subscription to your private web site if they subscribe to your free e-zine. For example, you could say, "Subscribe to our free e-zine and get free access to our private membership web site!" Another example, "Subscribe to our free e-zine and get a 3-month trial membership to our Members Only web site!"

You could offer your visitors a free advertisement in your free e-zine if they subscribe. For example, you could say, "Subscribe to our free e-zine and get a no-cost e-zine ad! Another example, "Subscribe to our free e-zine and get a free classified ad!"

You could offer your visitors a free, tangible gift if they subscribe to your free e-zine. For example, you could say, "Subscribe to our free e-zine and get our new report by mail!" Another example, "Subscribe to our free e-zine and get our new tips booklet by mail!"

You could offer free automatic entry into your contest or sweepstake if they subscribe to your free e-zine. For example, you could say, "Subscribe to our free e-zine and get free, automatic entry into our contest!" Another example, "Subscribe to our free e-zine for a chance to win a huge advertising package!"