One of the best tips I always try to stick to when using traffic exchanges is to only promote your opt in pages rather than your affiliate links to the affiliate websites, this creates more of a chance that someone will subscribe to your squeeze page than a normal affiliate link page.
You want to write a good headline for your opt in page and yes keep it short and bare in mind that when people use traffic exhcanges they are there to build up surfing credits so they may only have 20-30 seconds viewing time on your web page, so the trick is to make that 20-30 seconds count, by not over selling anything and just providing a few benefits of your free offer or report that your viewers can download.
Use bullet points to list the benefits, but remember not to give away too much at this stage as you can add further information in the email follow ups you send them, at the end of the opt in page, you could provide a strong call to action, like enter your name and email address for instant access to my free report! (or something along these lines!)
Keep up the promotions and to your success everyone!!