The Inchoo Adwords Conversion tracking module is really useful - and free. Here's the link: Inchoo.

However, if you use the new Responsive Theme (or 'RWD') for Magento from 1.9+, the Inchoo module stops working.

That's because it relies on a small layout file:

inchoo_google_adwords.xml

This file hides away in

app/design/frontend/default/default/layout

and is usually picked up by each theme on the checkout_success page to generate the appropriate call to Google.

However, the RWD theme doesn't call the files in that folder, it relies on its own layout folder.

So here's the solution:

Copy the inchoo_google_adwords.xml file into your theme's layout folder, eg:

app/design/frontend/my_responsive_theme/theme1/layout

And now it'll work.

Well, it did with mine.