Here's how it works :

Go to www.zenofeller.com/phpbb and register an account (you don't need email validation).

Make 30 posts.

PM zenofeller with an url containing a link to your banner (must be 725 by 88, 16kb max) and the url you want linked. You will be linked from www.zenofeller.com/links.html - first come first serve), and you get the link for 3 months.

Keep making 30 posts every 3 months, your link will stay live.

Dont's :

Don't spam-post.
Don't copy-paste post (some posts will be automatically checked on google, if it turns out you just copy-pasted something you'll simply get banned).
Don't make idiotic, out of context, or less than 12 words posts.

You may start new threads (appropriate forum, please) or post to existing ones, wide variety of subjects to chose from. Have fun.

If you want to pay 3$ for it. I am interested in posting 30 posts.

So use some of your affiliates for the link and you'll probably make more than 3 dollars.