Adwords is unbeatable when it comes to releasing kick ass features: Remarketing and Search Funnel
As described by Google, "Remarketing allows you to show ads to users who’ve previously visited your website as they browse the Web, giving you a powerful new way to match the right people with the right message."
You may find more info here: http://www.google.com/ads/innovations/remarketing.html
On the other corner, Search Funnel can help you understand how users search for your products before converting so that you can optimize these conversion paths. Increase the efficiency of your AdWords accounts by discovering and prioritizing assisting keywords, ad groups, and campaigns, in addition to those that convert.
So... If you're still using Adwords :) you should start using
these features now and gain advantage over your competition