Turnkey affiliate software and much much more
Your campaign reports can give you insight on your clicks, sales and conversions. You will be able to easily see which campaigns are generating sales and which ones are not if you use affiliate software to track it. Suppose you find out that your Adwords campaign in converting more visitors than your Overture campaign? You can then make changes and improve which ever campaign is doing poorly. Then use your affiliate software to find out if your improvements worked or not. Another benefit of using affiliate software is that you will not have to include multiple tracking sales codes.