RKG have published their 2nd quarter 2013 PPC marketing trends report.
Two things stand out to me:
(1) Adwords cost per click is up 10% year-on-year.
(2) 33% of Adwords clicks now come from Product Listing Ads. (If you sell products, you’ve got to take advantage of these).
You can read a full breakdown of the trends here:
Steve