The first widget for mainstream traffic trading is here!
 

EndlessTrade is the first widget you can use to trade traffic with similar sites.

Submit your sites in the directory, find sites you want to trade traffic with, even add trades to sites not present in the directory, and export them to the widget.
Of course you can rank your trades the way you want them.

Embed the widget on your site (javascript) and there you go, free traffic for life.

endlessforum.com/widget/