In order to track your return on investment (ROI) from AdWords, you need to be able to see which keywords, ads and campaigns lead to conversions on your site. If you use Google Analytics, you can now import your Google Analytics Goals and Transactions into your AdWords account to use as conversion actions. This lets you track the ROI from your AdWords campaigns directly inside the AdWords interface. Here's “how to get started” importing your Google Analytics Goals and Transactions into AdWords.