In their Friday blog, Google announced they have launched a new feature in the AdWords interface, Impression Share - the percentage of impressions your ads see. Thus giving very accurate numbers for total searches for all keywords or their expanded matches.
The feature is well detailed by the Googlers.
Search and traffic sourcing are both crucial to luring shoppers to your website. In this article, "2 Successful Holiday Strategies for Online Retail", you'll learn how to use a two-pronged approach for your holiday search campaigns that combine top keywords with the best referral sites. Data in this article comes from SimilarWeb.