There are many traffic networks, or exchanges, around. Some are spedrugsed, some more general, but in essence you will get visitors to your site in exchange for driving visitors to another.
This can work in many ways. For example, with a "banner exchange", you will show banner ads on your site, and for every ad you show your ad will be shown. Sometimes the ratio is different, such as 2:1, so you have to show another ad twice for every one you gain.
Other exchanges work via popups, popunders, pop-ins, etc. Some will use a widget on your site to show ads or images.
Traffic from an exchange is driven by traffic to your site. So the more traffic you have, the more you will receive. And the more you receive, the more that will generate. The sucess of an exchange depends on how many members there are, but it is worth joining them unless the design will not compliment your site or it will irritate your visitors.
As a rule you don't want anything on your site that encourages a visitor to leave, so you have to think carefully about where you place banners or widgets.
One other kind of exchange focuses on subscribers. This works in a similar way, except for every subscriber you can add, you can mail one more. Email exchanges often use a matrix or multi-level based system, so you refer new members. This way you will gain new subscribers for every one you add, but you also gain a percentage of the subscribers that any of these that you refer go on to add.
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