When it comes to keyword tracking - working out which keywords are responsible for your conversions - there are now many different options available.
You can get a Google Adwords, Yahoo or MSN pixel placed on the thank you page of the offer you’re promoting even if its not your thank you page. This is isn’t foolproof as pixel tracking doesn’t always track all conversions - it depends on where the pixel is put on the page, load time etc. It can also be a nuisance if you are promoting many different offers, especially in the beginning when you’re testing and don’t know if an offer is a keeper.